Glimpsed one of these in The Sweeney and I started thinking about Imps.
The basic Imp was discontinued in 1973. It had been conceived as a small car capable of carrying two adults and two children. At the time other small cars on the market included the Mini and the Fiat 500. the Imp had some important design features including an aluminium alloy engine and overhead camshaft.
Of course one rarely sees an Imp now - for all sorts of reasons. Perhaps with the rebirth of the small car it will make a return.