I believe, though I could be wrong, that it was based originally on the Rover 600, with much tweaking and tarting, which is where my dislike of it comes from. (R600 company car for 6 months) It has to be said, I've not seen one in the flesh, let alone driven or been in one, and tbh I'm not going to, I see no point in it other than what I've said already. Someone who definitely knows might chip in later, indeed others have suggested it's based on a R75 .. which was even worse, in my eyes, than the 600 .. ;)