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Guy Martin's Colombian adventure takes in some gravity racing on souped-up bikes, a dive into a narco-submarine, and a cup of very special 'tea'.

Guy Martin builds his own electric motorbike in a factory in Chongqing before visiting the world's biggest public toilet and heading along the Yangtze towards Shanghai.

Gus and Will seek a Scandinavian car and settle on a Saab. They'd prefer a classic 99, but can only find an older 99 that was bought for a rally but can't go the distance.

Gus and Will set out to buy a Honda-based Rover 800 coupe. At only 650 pounds it seems too good to be true - and when they turn up, they aren't sure whether to proceed.

Gus has his eye on a Citroen XM that looks amazing - but it's in France. Will isn't sure, but the engineering challenges win him over.

Gus and Will find an Audi Quattro roadster than has seen better days - it's full of problems, and hasn't been serviced in years. Even so, they are intent on renovating it.

Will and Gus head to London to buy a '73 Mk 4 Spitfire. It seems solid, but how it fares on the road remains to be seen.

Will and Gus look to make some quick cash as they fix and wrap a Toyota MR2 MK2. It's quick and it's cheap, but it's the lowest spec out there and it looks dowdy.

Robbie helps rescue a runaway narrowboat on the scenic Macclesfield Canal and cruises through autumn scenery toward Congleton to see a shipwreck up for sale.

Fallen trees block Robbie's journey on the Peak Forest Canal. Later, he meets TV host Terry Christian, whose dad once worked a local waterway.

Robbie visits a former Beatle's home in Henley, uncovers horror history in Marlow and struggles to find a mooring in Maidenhead on the River Thames.

Simon Reeve explores the beautiful and unique landscapes of the Lake District, beginning by meeting Cumbrians with different visions for its future.

Simon Reeve explores the impact of humans on the Lake District, discovering the high number of visitors to Scafell Pike is damaging the mountain and stretching rescue resources.

Simon Reeve comes to the end of his travels by exploring the rugged coast of Cumbria and learning how central the county is to many challenges facing Britain.

The team take on one of Derek's favourites - an Austin A35 - but its age ensures some hefty bills. To bank some cash, their second project is a quick flip - a 1999 BMW Z3.

Paul hits the road to collect an old navy ambulance that served its time as a holiday camper.

The A4 LNER Pacific Locomotive Sir Nigel Gresley must be hauled 46 miles at 30mph from Crewe to Bridgnorth.