The little girl who lives next door is intent on sabotaging his project at any cost, but when he wins her over with a smile, she ends up helping him to build it.

He completes the project and wins the hand of the girl’s older sister, who has been dating a mannerless local who tears around in a sports car.

As well as Farnborough, parts of the filming took place at the petrol station in Bucks Horn Oak, Hampshire and Seale, Surrey.

The music was by Ron Grainer and includes a pastiche of the theme from Steptoe and Son when an old rag and bone man tries to steal the front wings and radiator shell from the still incomplete car.

Others were The North Sea Quest, Overhaul, Crown of Glass, Roads to Roam, The Small Propeller, The Cattle Carters, Prospect for Plastics, A Journey into the Weald of Kent, Giuseppina and Evoluon.