It is a Microplas Toledo as Front Man says: the Stiletto came later.
It was a design of Bill Ashton, Mike Eyres and Sandy and Tony Wemyss, yes, and was based on an Austin 7 chassis, although it could be mounted on other chassis too.
Since barrett seems to have abondoned his puzzles I'll leave it a bit longer and if he doesn't reply I'll award points and move this to solved.