Only Fools and Horses - Season 1 Episode 6

Another successful dodgy deal means Del has over a grand's worth of lead from a disused factory to get rid of. When Rodney points out the three tons of lead are in fact a D.I.Y nuclear fall-out shelter, Del refuses to believe him until he reads the accompanying brochure. With the threat of nuclear holocaust preying on Rodney's nerves he asks Del what he'd do if he heard the four minute warning. Without an answer, Del considers putting a survival plan into action that means reaching Grandad's allotment in time to take shelter. It's during a practice run for the Trotter counter-strike survival plan that they get stopped for speeding by the police – they never get to find out whether they'd make it in time.