BBC Four Wednesday

Michael Portillo begins the final leg of his journey at the Transport Research Laboratory in Wokingham, where they have been keeping Britain's roads safe for 90 years

On the last leg of his epic journey across the north of England, narrowboater Robbie Cumming tackles the fast-flowing River Ouse while heading to Ripon

Exploring the realm of the creatures to better understand how they have evolved and scientists search for a single common insect ancestor

Why the Germans fought on despite disastrous military defeats between autumn 1942 and winter 1943

Lucinda Lambton investigates the history of the great estate of Castle Leslie in Co Monaghan. First broadcast March 17, 2002

Mary's marriage to Nicky feels the strain of infidelity and overwork. An alcoholic Geordie finds himself without a roof over his head, and Tosker's fortune is jeopardised

The friends hold a reunion eight years after Mary and Nicky's last meeting as Tosker launches his floating nightclub on the Tyne and Geordie escapes from prison

The team travels across Great Britain to investigate evidence that suggests the search for alien life may lie within Earth's own solar system

Robbie Cumming explores the Victorian West Yorkshire village of Saltaire on the Leeds and Liverpool Canal and searches for an abandoned waterway on the Aire and Calder

On the last leg of his epic journey across the north of England, narrowboater Robbie Cumming tackles the fast-flowing River Ouse while heading to Ripon

Exploring the realm of the creatures to better understand how they have evolved and scientists search for a single common insect ancestor

Michael Portillo begins the final leg of his journey at the Transport Research Laboratory in Wokingham, where they have been keeping Britain's roads safe for 90 years