In Italy, there are perhaps 40 of them, mainly in the ultralight category, although I think a few are on grown-up registrations too. Elsewhere, very few if any.
I recall Burman Aviation (as they then were, under James Catto) had one at a Helitech exhibition with lots of trumpeting that they were the new UK dealer blah-de-blah. Bbut that must have been 1999 I suppose - certainly prior to Mr Rigby's money coming along and the company getting named after a famous missile!