Series D, Episode 4. First broadcast on Monday, 19 October 1981.

Brendan’s Vin Diesel impersonation has knackered Scorpio even more than usual, and James is avoiding repairs by pretending he’s had too much Red Bull. Conrad has found a solution by studying slow motion footage of a biker’s helmet, but it will only work if we can disguise the fact that Mark refuses to go on location. It’s Stardrive.