Well, the prototype is the only one to have flown, to my knowledge, and there are only two on the UK register - G-BBJI and G-BXOM, which is being built by a Welsh bloke whom I'm going to see next weekend.
I'm planning on joining the PFA very soon. In fact, I'll send a cheque for my membership along with one for my Spitfire plans. Sandy Hutton is on his way up here next Friday as it happens....