Steered by his Bradshaw's guide, Michael Portillo heads for the Hertfordshire village of Perry Green to learn about Henry Moore became one of the defining artists of British modernism.

Oh, Mr Porter, what could he do? Michael Portillo is in Crewe, a town steeped in railway history and immortalised in Victorian music hall, to investigate the making of the iconic cinema classic, The Night Mail during the 1930s.