You end up with the entire collection of 75 Matchbox miniatures (and I've still got the VW golf with the surfboards on the roof after all these years!) but what good were they, really, without their own 70's Sim City to send them round?
Roadmaker was the answer! A box of interlocking bends, straights, junctions and traffic lights which gave budding 11 year olds the opportunity to create their very own Milton Keynes in their front rooms. It was obviously a very influential toy. Guess what I do for a living nowadays?