Michael Portillo explores the postwar Britain of his youth on a railway journey from the Midlands to the West Country.

Beginning in Derby's famous 19th-century railway works, Michael hears how the Victorian sheds now house some of the most up to date assembly lines in Britain for building electric trains. In Leicester, Michael looks back to the early 1970s, when around 10,000 Asians arrived in the city after being expelled from Uganda by the dictator Idi Amin.

On the outskirts of the city, Michael discovers a factory where, shortly after the Second World War, an entrepreneurial butcher turned his hand to something completely different - with the company he founded, Walkers, now producing 11 million bags of crisps a day. And from Hinkley Station, Michael heads for Stoney Cove, where a submerged quarry proved an ideal place to train divers in the 60s and 70s.

Michael Portillo's railway journey reaches the heart of the Warwickshire countryside, where work is underway on a section of the biggest project of new railway infrastructure in Britain for a hundred years: HS2.

In the Tudor town of Stratford-upon-Avon, birthplace of William Shakespeare, Michael visits the Royal Shakespeare Theatre, home since 1961 to the Royal Shakespeare Company.

In Birmingham, Michael recalls the redevelopment of the whole city centre during the 1960s and the arrival of black and Asian communities in areas where he once tried to enter parliament. In the Prince of Wales pub in Handsworth, he investigates the fusion of Asian and British cultural influences which produced modern Bhangra music.

Michael finishes this leg of his railway journey in the leafy suburb of Moseley, where in order to combat the housing shortage after the Second World War, prefabricated houses were put up - and, in some cases, remain to this day.