The Rock: Exploring the Tunnels of Gibraltar, a Second World War espionage base, hidden in the Rock of Gibraltar. S10 Ep2.

Ememy At The Gates: Exploring a series of vaults, hidden from view in Edinburgh, Scotland that tell a murky story of opportunity, crime and destitution. S10 Ep3.

Shopping from Home.

Murder Raid Tunnels: Exploring the extensive air raid tunnels hidden beneath Ramsgate. Also, how the former thriving mining town of Butte, Montana repurposed the 10,000 miles of tunnels. S2 Ep1.

Grand Canyon's Lost Treasure: Exploring inside the Grand Canyon Caverns - North America's largest dry cave system. Plus, Cold War radar bunkers around the UK. S2 Ep2.

Cincinnati's Secret Caverns: Exploring the forgotten underworld hiding beneath the streets of Cincinnati, USA. Plus, a state-of-the-art Cold War fortress on the shores of Denmark. S2 Ep3.

Hotel Bunker of the Apocalypse: Exploring the secret, Cold War US government bunker hidden under Greenbrier Hotel, West Virginia; Plus, delve into the depths of a former slate mine in Wales, UK. S2 Ep.

Mystery of the Kentucky Cave: Exploring the vast 400-mile Mammoth Cave in Kentucky, USA. Plus, a newly constructed opening into a metal mine in Wales - untouched for over 70 years. S2 Ep5.

Ireland's Underground Alcatraz: Exploring hidden defences that have kept Cork Harbour, in Ireland, safe for over 400 years. Plus, a former submarine base in the fjords of northern Norway. S2 Ep6.

Murder Raid Tunnels: Exploring the extensive air raid tunnels hidden beneath Ramsgate. Also, how the former thriving mining town of Butte, Montana repurposed the 10,000 miles of tunnels. S2 Ep1.

Grand Canyon's Lost Treasure: Exploring inside the Grand Canyon Caverns - North America's largest dry cave system. Plus, Cold War radar bunkers around the UK. S2 Ep2.

Burning the Books: Sun Hill CID are on the trail of a thug who has stolen an important briefcase. S1 Ep9.

Death of a Cracksman: Officers from Sun Hill investigate an old fashioned safe cracker. S1 Ep10.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep9.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep10.

Mia returns to Manchester, having seemingly changed her ways and anxious to bury the hatchet. However, her conflict with Allie soon resurges. S3 Ep5.

Burning the Books: Sun Hill CID are on the trail of a thug who has stolen an important briefcase. S1 Ep9.

Death of a Cracksman: Officers from Sun Hill investigate an old fashioned safe cracker. S1 Ep10.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep9.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep10.

Mia returns to Manchester, having seemingly changed her ways and anxious to bury the hatchet. However, her conflict with Allie soon resurges. S3 Ep5.

Grand Canyon's Lost Treasure: Exploring inside the Grand Canyon Caverns - North America's largest dry cave system. Plus, Cold War radar bunkers around the UK. S2 Ep2.

Cincinnati's Secret Caverns: Exploring the forgotten underworld hiding beneath the streets of Cincinnati, USA. Plus, a state-of-the-art Cold War fortress on the shores of Denmark. S2 Ep3.

Hotel Bunker of the Apocalypse: Exploring the secret, Cold War US government bunker hidden under Greenbrier Hotel, West Virginia; Plus, delve into the depths of a former slate mine in Wales, UK. S2 Ep.

Shopping from Home.

Following Traditions: Animals, like humans, are capable of inventing improved ways of accomplishing tasks. But how do knowledge and culture spread in animal communities? S1 Ep1.

Friends First: We already know that animals have family, but do their relationships extend into the realm of friendship as well? S1 Ep2.

Family Secrets: Family often forms the epicentre of social networks. Animals like Grevy's zebra have loose family ties, while for the spotted hyena, family is a source of privilege. S1 Ep3.

Stronger Together: With ecosystems under extreme pressure, animals must draw strength from their group resilience which allows them to adapt, transform and weather the storm. S1 Ep4.

Personality: As with humans, animals have their own unique personalities. Each individual uses their own tactics to navigate their relationships and social networks. S1 Ep5.

The Dry Forest: Costa Rica's unique forest - abundant during the rainy season, camouflaged and asleep during the dry season - is home to a splendid diversity of plants and wildlife. S1 Ep1.

Following Traditions: Animals, like humans, are capable of inventing improved ways of accomplishing tasks. But how do knowledge and culture spread in animal communities? S1 Ep1.

Friends First: We already know that animals have family, but do their relationships extend into the realm of friendship as well? S1 Ep2.

The Sweet Smell of Failure: A tip in a counterfeit perfume case leads Carver and Ackland to two pensioners who have a reputation for stealing things. S1 Ep11.

Snouts and Red Herrings: Series two of the iconic police drama series begins with a chaotic day at Sun Hill, featuring workmen, new cases and a new PC named Abel Lyttleton. S2 Ep1.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep11.

Personality: As with humans, animals have their own unique personalities. Each individual uses their own tactics to navigate their relationships and social networks. S1 Ep5.

Finn's relationship with Allie starts to fall apart, and the revelation surrounding Ralfie may be the final straw. S3 Ep6.

The Sweet Smell of Failure: A tip in a counterfeit perfume case leads Carver and Ackland to two pensioners who have a reputation for stealing things. S1 Ep11.

Snouts and Red Herrings: Series two of the iconic police drama series begins with a chaotic day at Sun Hill, featuring workmen, new cases and a new PC named Abel Lyttleton. S2 Ep1.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep11.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep12.

Finn's relationship with Allie starts to fall apart, and the revelation surrounding Ralfie may be the final straw. S3 Ep6.

Friends First: We already know that animals have family, but do their relationships extend into the realm of friendship as well? S1 Ep2.

Family Secrets: Family often forms the epicentre of social networks. Animals like Grevy's zebra have loose family ties, while for the spotted hyena, family is a source of privilege. S1 Ep3.

Stronger Together: With ecosystems under extreme pressure, animals must draw strength from their group resilience which allows them to adapt, transform and weather the storm. S1 Ep4.

Shopping from Home.

Tim Dunn rides up Mt Snowdon's railway to visit the summit station, and discovers how a glass structure envelopes Strasbourg's 19th century station. S1 Ep7.

Tim Dunn visits the former HQ of London Underground, 55 Broadway, which was the capital's first skyscraper, and sees the timber-framed Barmouth Bridge in north Wales. S1 Ep8.

Tim Dunn visits the architecture of the Stockton & Darlington railway, the first passenger steam line in the world and learns how Essex's enormous Chappel Viaduct was built. S1 Ep9.

Tim Dunn visits Swindon's railway village, which became home to Great Western's enormous works and he also explores the dark and secret past of Milan's monumental station. S1 Ep10.

Wemyss Bay: Tim Dunn visits Wemyss Bay Station in Inverclyde - an architectural gem. He also explores the engineering marvel that is Blackfriars station in central London. S2 Ep1.

Royal Albert Bridge: Tim Dunn visits the Royal Albert Bridge and discovers how it was constructed. He also visits Wolverhampton to learn the history of its train stations. S2 Ep2.

Tim Dunn rides up Mt Snowdon's railway to visit the summit station, and discovers how a glass structure envelopes Strasbourg's 19th century station. S1 Ep7.

Tim Dunn visits the former HQ of London Underground, 55 Broadway, which was the capital's first skyscraper, and sees the timber-framed Barmouth Bridge in north Wales. S1 Ep8.

Suspects: Roach leads the investigation into an armed robbery at the wages office of an umbrella manufacturing company. S2 Ep2.

Lost: Sun Hill officers investigate the disappearance of an eight-year-old girl. S2 Ep3.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep13.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep14.

Allie opens her own hairdressing academy - and also learns she might be pregnant. Unfortunately, Gavin is having second thoughts about their relationship. S4 Ep1.

Suspects: Roach leads the investigation into an armed robbery at the wages office of an umbrella manufacturing company. S2 Ep2.

Lost: Sun Hill officers investigate the disappearance of an eight-year-old girl. S2 Ep3.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep13.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep14.

Allie opens her own hairdressing academy - and also learns she might be pregnant. Unfortunately, Gavin is having second thoughts about their relationship. S4 Ep1.

Tim Dunn visits the former HQ of London Underground, 55 Broadway, which was the capital's first skyscraper, and sees the timber-framed Barmouth Bridge in north Wales. S1 Ep8.

Tim Dunn visits the architecture of the Stockton & Darlington railway, the first passenger steam line in the world and learns how Essex's enormous Chappel Viaduct was built. S1 Ep9.

Tim Dunn visits Swindon's railway village, which became home to Great Western's enormous works and he also explores the dark and secret past of Milan's monumental station. S1 Ep10.

Shopping from Home.

More real-life drama with Yorkshire Ambulance Service's Hazardous Area Response Team. The team race to save an injured woman trapped in a van crushed between two lorries. S1 Ep7.

Hit the road with Yorkshire Ambulance Service's Hazardous Area Response Team. This episode features a stand-off involving a man with a samurai sword in South Yorkshire. S1 Ep8.

The fast-paced reality series continues. HART staff must treat one of their own after a freak accident involving a 4x4 leaves an off-duty medic with serious injuries. S1 Ep9.

One more shift with Yorkshire Ambulance Service's Hazardous Area Response Team. The team are called into action when an explosion demolishes a block of flats. S1 Ep10.

The response team race to the rescue of a worker trapped in a collapsed trench, and paramedic Kim must risk her own life to give him medical treatment 10ft underground. S2 Ep1.

A truck driver is trapped in his crushed cab after a motorway smash, while in Hull, firefighters handcuff a man to the rails of the Humber Bridge to stop him from jumping. S2 Ep2.

More real-life drama with Yorkshire Ambulance Service's Hazardous Area Response Team. The team race to save an injured woman trapped in a van crushed between two lorries. S1 Ep7.

Hit the road with Yorkshire Ambulance Service's Hazardous Area Response Team. This episode features a stand-off involving a man with a samurai sword in South Yorkshire. S1 Ep8.

Home Beat: In this episode, Brownlow tries to start a Neighbourhood Watch program within Sun Hill. S2 Ep4.

Hostage: Roach and Cryer take charge of a siege operation. S2 Ep5.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep15.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep16.

The academy is plunged into chaos by disruptive students, forcing Allie to rely more and more on Melissa to keep things in order. S4 Ep2.

Home Beat: In this episode, Brownlow tries to start a Neighbourhood Watch program within Sun Hill. S2 Ep4.

Hostage: Roach and Cryer take charge of a siege operation. S2 Ep5.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep15.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep16.

The academy is plunged into chaos by disruptive students, forcing Allie to rely more and more on Melissa to keep things in order. S4 Ep2.

Hit the road with Yorkshire Ambulance Service's Hazardous Area Response Team. This episode features a stand-off involving a man with a samurai sword in South Yorkshire. S1 Ep8.

The fast-paced reality series continues. HART staff must treat one of their own after a freak accident involving a 4x4 leaves an off-duty medic with serious injuries. S1 Ep9.

One more shift with Yorkshire Ambulance Service's Hazardous Area Response Team. The team are called into action when an explosion demolishes a block of flats. S1 Ep10.

Shopping from Home.

Medics treat a man who appears to be having a heart attack and needs to be taken to hospital, and a man who got so confused he came home early from his holiday. S5 Ep3.

A girl suffers life-threatening breathing difficulties at school, an elderly lady is struggling with an infection and dementia, and a young father experiences worrying chest pains. S5 Ep4.

A teenager is in excruciating pain after falling and injuring his leg, and paramedics treat a 94-year-old man showing signs of a stroke. Plus, a man with severe stomach pain. S5 Ep5.

A young girl is reluctant to let the paramedics examine her cut head and a mature student needs medical help. S5 Ep6.

Paramedics help an 81-year-old woman with dementia - but must earn her trust before she will let them in. Plus, a Polish man suffering from agonising abdominal pain. S5 Ep7.

A newborn baby has breathing problems, paramedics treat an elderly lady who's fallen and hit her head, and crewmates investigate the worrying symptoms of a potential stroke victim. S5 Ep8.

Medics treat a man who appears to be having a heart attack and needs to be taken to hospital, and a man who got so confused he came home early from his holiday. S5 Ep3.

A girl suffers life-threatening breathing difficulties at school, an elderly lady is struggling with an infection and dementia, and a young father experiences worrying chest pains. S5 Ep4.

This Little Pig: Edwards corners a pig that was released from the City Farm. S2 Ep6.

Ringer: A serious road crash results in six deaths. Meanwhile, Frank Burnside goes under cover. S2 Ep7.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep17.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep18.

Allie's illness puts a strain on her relationship, leading Gavin to seek solace with Melissa. Drama, starring Sarah Parish. S4 Ep3.

This Little Pig: Edwards corners a pig that was released from the City Farm. S2 Ep6.

Ringer: A serious road crash results in six deaths. Meanwhile, Frank Burnside goes under cover. S2 Ep7.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep17.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep18.

Allie's illness puts a strain on her relationship, leading Gavin to seek solace with Melissa. Drama, starring Sarah Parish. S4 Ep3.

A girl suffers life-threatening breathing difficulties at school, an elderly lady is struggling with an infection and dementia, and a young father experiences worrying chest pains. S5 Ep4.

A teenager is in excruciating pain after falling and injuring his leg, and paramedics treat a 94-year-old man showing signs of a stroke. Plus, a man with severe stomach pain. S5 Ep5.

A young girl is reluctant to let the paramedics examine her cut head and a mature student needs medical help. S5 Ep6.

Shopping from Home.

The Secret Bunker: Exploring a desert island with an infected past adrift from the US mainland, the brutalist palace of a mad Bulgarian dictator, and a doomed top-secret Nazi project. S8 Ep7.

The Battle of San Pietro: Exploring Italian ruins immortalised by Hollywood, a crumbling Chilean city with two lives and a brutalist Scottish relic whose prayers went unanswered. S8 Ep8.

Divine Intervention: Exploring a luxury resort that conceals a top-secret facility, a mysterious complex in Bali struck by disaster, and a relic of hope near Jerusalem. S8 Ep9.

Shadow of the Wars: Exploring a dystopian powerhouse in Pennsylvania, USA, a fairy-tale castle in Poland and Anglo-Saxon religious ruins across vast plains of Scotland. S8 Ep10.

Death In Paradise: Exploring a bloody battleground on the Pacific Island of Peleliu and an ominous military stronghold in Russia. S8 Ep11.

Before The Crown: Exploring the honeymoon home of a young princess and grand monuments designed by the most notorious dictator of the twentieth century. S8 Ep12.

The Secret Bunker: Exploring a desert island with an infected past adrift from the US mainland, the brutalist palace of a mad Bulgarian dictator, and a doomed top-secret Nazi project. S8 Ep7.

The Battle of San Pietro: Exploring Italian ruins immortalised by Hollywood, a crumbling Chilean city with two lives and a brutalist Scottish relic whose prayers went unanswered. S8 Ep8.

Public and Confidential: A Polish sailor seeks political asylum at Sun Hill station. S2 Ep8.

Loan Shark: After being caught shoplifting, a young mother confesses to Cryer that she is in debt to a loan shark. S2 Ep9.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep19.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep20.

Allie decides to confront her mortality, while the family inadvertently exposes Liam's lies after using his celebrity connections to drum up support. S4 Ep4.

Public and Confidential: A Polish sailor seeks political asylum at Sun Hill station. S2 Ep8.

Loan Shark: After being caught shoplifting, a young mother confesses to Cryer that she is in debt to a loan shark. S2 Ep9.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep19.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep20.

Allie decides to confront her mortality, while the family inadvertently exposes Liam's lies after using his celebrity connections to drum up support. S4 Ep4.

The Battle of San Pietro: Exploring Italian ruins immortalised by Hollywood, a crumbling Chilean city with two lives and a brutalist Scottish relic whose prayers went unanswered. S8 Ep8.

Divine Intervention: Exploring a luxury resort that conceals a top-secret facility, a mysterious complex in Bali struck by disaster, and a relic of hope near Jerusalem. S8 Ep9.

Shadow of the Wars: Exploring a dystopian powerhouse in Pennsylvania, USA, a fairy-tale castle in Poland and Anglo-Saxon religious ruins across vast plains of Scotland. S8 Ep10.

Shopping from Home.

Moonshot: Exploring an industrial ruin in the Florida Everglades that once competed in the greatest race humankind has ever witnessed. S10 Ep6.

Rock And Ruin: Exploring traces of a mass deception hidden at Ponte Dirillo in Italy, as well as a once lavish theatre in Ohio and an ancient city with a poisonous secret. S10 Ep7.

Castle Of The Occult: Exploring a dense forest near the Czech capital of Prague that hides Houska Castle, an eerie castle rumoured to possess supernatural powers. S10 Ep8.

The Green Line: Exploring Serbia, Fort Pike in Louisiana, and a mountainside refuge in Georgia that was revealed to the world by an act of God. S10 Ep9.

Blitz Spirit: Exploring a grand structure in Hull that was reduced to rubble by Hitler's planes, Casa Albero in Italy, USS Hornet in California and the Sofia tunnels. S10 Ep10.

An American Exodus: Exploring a decrepit Liberian landmark with American origins, a desolate town in Belgium and a pioneering scientific structure in Cleveland. S10 Ep11.

Moonshot: Exploring an industrial ruin in the Florida Everglades that once competed in the greatest race humankind has ever witnessed. S10 Ep6.

Rock And Ruin: Exploring traces of a mass deception hidden at Ponte Dirillo in Italy, as well as a once lavish theatre in Ohio and an ancient city with a poisonous secret. S10 Ep7.

With Friends Like That.?: Cryer brings in Debbie Lindfield, who is reluctant to report a rape. S2 Ep10.

Whose Side Are You On?: Officers from Sun Hill take on a local youth group in a five-a-side indoor football match. S2 Ep11.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep21.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep22.

The family gathers for Allie's funeral, but it seems her secrets will not stay buried. S4 Ep5.

With Friends Like That.?: Cryer brings in Debbie Lindfield, who is reluctant to report a rape. S2 Ep10.

Whose Side Are You On?: Officers from Sun Hill take on a local youth group in a five-a-side indoor football match. S2 Ep11.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep21.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep22.

The family gathers for Allie's funeral, but it seems her secrets will not stay buried. S4 Ep5.

Rock And Ruin: Exploring traces of a mass deception hidden at Ponte Dirillo in Italy, as well as a once lavish theatre in Ohio and an ancient city with a poisonous secret. S10 Ep7.

Castle Of The Occult: Exploring a dense forest near the Czech capital of Prague that hides Houska Castle, an eerie castle rumoured to possess supernatural powers. S10 Ep8.

The Green Line: Exploring Serbia, Fort Pike in Louisiana, and a mountainside refuge in Georgia that was revealed to the world by an act of God. S10 Ep9.

Shopping from Home.

Medieval Maze of Secrets: Exploring long narrow tunnels beneath Exeter that were built in medieval times to protect the city. Plus, a marble quarry under the pine forests of Vermont. S2 Ep7.

Buried Lab of the Black Hills: Exploring a former gold mine turned scientific laboratory in South Dakota. Plus, limestone tunnels in London and a former water cistern in Denmark. S2 Ep8.

Subterranean Silo Survival: Exploring old tunnels in an abandoned tin mine beneath the moors of Cornwall. Plus, former Atlas missile siloes in Kansas and tunnels hiding under Valetta. S2 Ep9.

Italy's Subterranean Secret: Exploring caves beneath Orvieto in Italy, originally built by the Etruscans long before the Roman Empire. Plus, a former limestone mine under Kansas City. S2 Ep10.

Spitfire: On the legendary Battle of Britain airfield at Biggin Hill, a dedicated team of young engineers restore to flight a Spitfire that fought over Europe in 1944. S1 Ep1.

DC3 (C47): A US Army Air Force C47 that dropped paratroopers on D-Day is at the centre of one of the UK's most ambitious warbird rebuilds. S1 Ep2.

Medieval Maze of Secrets: Exploring long narrow tunnels beneath Exeter that were built in medieval times to protect the city. Plus, a marble quarry under the pine forests of Vermont. S2 Ep7.

Buried Lab of the Black Hills: Exploring a former gold mine turned scientific laboratory in South Dakota. Plus, limestone tunnels in London and a former water cistern in Denmark. S2 Ep8.

The Chief Super's Party: The second series of the iconic police drama concludes as Brownlow throws a farewell party for his retiring clerk. S2 Ep12.

The New Order of Things: Sgt Peters and Sgt Penny apprehend a man who is waiting to attack PC Muswell. Carver begins his CID training. S3 Ep1.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep23.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep24.

Gavin makes plans for the future, but the Henshalls are far from happy with what he has in mind. S4 Ep6.

The Chief Super's Party: The second series of the iconic police drama concludes as Brownlow throws a farewell party for his retiring clerk. S2 Ep12.

The New Order of Things: Sgt Peters and Sgt Penny apprehend a man who is waiting to attack PC Muswell. Carver begins his CID training. S3 Ep1.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep23.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep24.

Gavin makes plans for the future, but the Henshalls are far from happy with what he has in mind. S4 Ep6.

Buried Lab of the Black Hills: Exploring a former gold mine turned scientific laboratory in South Dakota. Plus, limestone tunnels in London and a former water cistern in Denmark. S2 Ep8.

Subterranean Silo Survival: Exploring old tunnels in an abandoned tin mine beneath the moors of Cornwall. Plus, former Atlas missile siloes in Kansas and tunnels hiding under Valetta. S2 Ep9.

Italy's Subterranean Secret: Exploring caves beneath Orvieto in Italy, originally built by the Etruscans long before the Roman Empire. Plus, a former limestone mine under Kansas City. S2 Ep10.

Shopping from Home.

Explore New Zealand's rugged fjords, high mountain peaks, steaming volcanic landscapes and bizarre cave systems, crossed with lush rainforests and fields that profit from volcanic soil. S1 Ep1.

With damage caused by climate change as glaciers melt and forests are replaced by pastureland, New Zealand faces major challenges and is responding with a radical environmental policy. S1 Ep2.

The Forest: Explore the Danish wildlife as we go inside a fox den with a mother fox and her newborn cubs and soar with a majestic golden eagle while it is out hunting. S1 Ep1.

The Sea and the Coastline: Dive into the sea around Denmark and meet the creatures that live there. We spot the anglerfish that camouflages itself on the ocean floor. S1 Ep2.

The Open Land: Nature in the open countryside: the heath, the marsh, the flower meadows and the cultivated fields. We meet a yellow-necked mouse out for a midnight bite. S1 Ep3.

The Lake and the River: In a reed warbler nest by the lake shore, we watch as the newly hatched cuckoo instinctively evicts the host bird's young to get all the food to itself. S1 Ep4.

Explore New Zealand's rugged fjords, high mountain peaks, steaming volcanic landscapes and bizarre cave systems, crossed with lush rainforests and fields that profit from volcanic soil. S1 Ep1.

With damage caused by climate change as glaciers melt and forests are replaced by pastureland, New Zealand faces major challenges and is responding with a radical environmental policy. S1 Ep2.

Some You Win, Some You Lose: Chief Superintendent Brownlow and DI Galloway lead a massive raid on a drug den within a local council estate. S3 Ep2.

Brownie Points: PC Reg Hollis is nominated for the position of the station's police federation representative. S3 Ep3.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep25.

The Lake and the River: In a reed warbler nest by the lake shore, we watch as the newly hatched cuckoo instinctively evicts the host bird's young to get all the food to itself. S1 Ep4.

The friends gather to celebrate with Jessica, who is getting married to a rich playboy. Katie catches the eye of a new colleague and Siobhan harbours a dark secret. S2 Ep1.

Some You Win, Some You Lose: Chief Superintendent Brownlow and DI Galloway lead a massive raid on a drug den within a local council estate. S3 Ep2.

Brownie Points: PC Reg Hollis is nominated for the position of the station's police federation representative. S3 Ep3.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep25.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep26.

The friends gather to celebrate with Jessica, who is getting married to a rich playboy. Katie catches the eye of a new colleague and Siobhan harbours a dark secret. S2 Ep1.

With damage caused by climate change as glaciers melt and forests are replaced by pastureland, New Zealand faces major challenges and is responding with a radical environmental policy. S1 Ep2.

The Forest: Explore the Danish wildlife as we go inside a fox den with a mother fox and her newborn cubs and soar with a majestic golden eagle while it is out hunting. S1 Ep1.

The Sea and the Coastline: Dive into the sea around Denmark and meet the creatures that live there. We spot the anglerfish that camouflages itself on the ocean floor. S1 Ep2.

Shopping from Home.

Windsor: Tim Dunn is in Windsor to learn how two rail companies fought to be first to get to Queen Victoria. He also explores the Connel Bridge in the Scottish Highlands. S2 Ep3.

Piccadilly Line: Tim Dunn is in London exploring the striking stations of the Piccadilly Line's northern extension. Tim also takes a look at Causey Arch in County Durham. S2 Ep4.

Lynton: Tim Dunn rides on a funicular railway powered by water. Also, how an abandoned Victorian railway tunnel in Northamptonshire is being transformed into a racetrack. S2 Ep5.

Barrow Hill: Tim explores the last working roundhouse in the UK, Barrow Hill in Derbyshire. Tim also visits Bath, a city renowned for its Georgian architecture. S2 Ep6.

Sheffield: Tim visits Sheffield station which been reinvented for the 21st century. He also helps to restore the Bennerley Viaduct in the Erewash valley. S2 Ep7.

Bristol: Tim Dunn goes behind the scenes at Bristol Temple Meads, a Grade 1 listed station, and is given special access to Brunel's old Tudor station and boardroom. S2 Ep8.

Windsor: Tim Dunn is in Windsor to learn how two rail companies fought to be first to get to Queen Victoria. He also explores the Connel Bridge in the Scottish Highlands. S2 Ep3.

Piccadilly Line: Tim Dunn is in London exploring the striking stations of the Piccadilly Line's northern extension. Tim also takes a look at Causey Arch in County Durham. S2 Ep4.

Missing, Presumed Dead: A shooting occurs in Sun Hill but none of the neighbours appear to have witnessed anything. S3 Ep4.

Domestics: PC Smith must give advice to a husband whose wife has relocated to a women's refuge. S3 Ep5.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep27.

Quiz in which contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers that no-one else can think of. S26 Ep28.

Siobhan fears her secret liaison's are about to be exposed when a new client turns out to be one of her night-time conquests. Trudi grows suspicious of Richard's spending habits. S2 Ep2.

Missing, Presumed Dead: A shooting occurs in Sun Hill but none of the neighbours appear to have witnessed anything. S3 Ep4.