Two couples take part in the annual London to Brighton Veteran Car Run with their vintage automobiles. Alan McKim, an enthusiastic classic car owner, drives his 1904 Darracq with his wife, Wendy, in the passenger seat. Their friends, Ambrose Claverhouse and his glamorous girlfriend, Rosalind Peters, join the race in Ambrose’s 1905 Spyker. The journey quickly reveals not only the quirks and challenges of driving such old vehicles but also the underlying tensions in their relationships. The couples struggle with bouts of competitiveness, mechanical breakdowns, and various comedic mishaps along the way, heightening the drama of the road trip.

As Alan and Ambrose’s rivalry intensifies, so does the strain on their relationships. Problems arise that test the patience of both the drivers and their companions, leading to humorous and tense interactions. In the background, the picturesque countryside and the enthusiasm of other participants emphasize the charm and nostalgia associated with the event. Each pair must navigate their individual and collective hurdles as they push towards the finish line, discovering more about themselves and each other through the tribulations and joys of the journey.