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Michael Portillo travels through Germany, revealing how British yachtsmen spied on the German navy in the early 20th century.

Michael Portillo travels through Scandinavia, crossing the bridge linking Denmark to Sweden to retrace the train journey of a revolutionary Russian passenger.

A rare 1968 Honda N600 car emerges from a lock up in County Durham and Derek's in Scotland to collect an original RAC Bedford van.

Derek collects five beautiful veteran motorbikes from an enthusiast who's still happily riding in his 90s.

Experts uncover a WWII German trench system revealing a daring commando raid to capture it. And, the sunken remains of a tank show how dangerous preparations for D-Day were.

The role played by engineering giant Vickers during the Second World War, including the development of the Spitfire and how the Royal Navy recovered from losing so many warships.

Fiona Bruce and the team return to Cardiff Castle where items include an elaborately decorated Indian flask and a rare piece of porcelain.

Stormont Parliament Buildings and Estate 1: Fiona Bruce presents from the Stormont Parliament Building in Belfast, where items to be valued include diving gear from the Titanic.

Derek picks up a one owner Mark 1 Cortina that's been holed up in a garage for over a quarter of a century. Paul and daughter Kate collect a Reliant Sc.

Opel Manta GT/1902 Oldsmobile/Morris Oxford/Volvo Torslanda Estate: Derek collects an Opel Manta, Charlie and his mum pick up a Morris Oxford, and Paul is enthralled by a motoring relic.

Experts uncover a WWII German trench system revealing a daring commando raid to capture it. And, the sunken remains of a tank show how dangerous preparations for D-Day were.

The role played by engineering giant Vickers during the Second World War, including the development of the Spitfire and how the Royal Navy recovered from losing so many warships.

Fiona Bruce and the team return to Cardiff Castle where items include an elaborately decorated Indian flask and a rare piece of porcelain.

Simon Reeve examines the friction between Eastern and Western mentalities in Turkey, finding tension between liberal and Islamic cultures.

In the fifth and final leg of his journey, Simon travels across Central America from the Caribbean to the Pacific by beginning in Belize and finishing his trip in Costa Rica.

The explorer visits an Indonesian island where people practice the ancient religion of Marapu, whose ancestral spirits demand blood sacrifice from its followers.

Derek picks up a one owner Mark 1 Cortina that's been holed up in a garage for over a quarter of a century. Paul and daughter Kate collect a Reliant Sc.