Plot: William Woollard presents the programme from the Motor Industry Research Association in Warwickshire, used by many of the world’s motor manufacturers to develop their new models. Tiff Needell explores the different ways cars behave in emergency situations, Jeremy Clarkson tests the new model Ford Escort and Tony Mason joins former motorsport stars Paddy Hopkirk, Stirling Moss and Roger Clark on the 1990 Pirelli Classic Marathon