I think there is like 2 of them in Great Britain, thereoff 1 in Wales.
Check out IWM's website (Duxford part) and look carefully, If my memory serves me there is a link to some information about the double seater there.
I was fortunate enough to see one flying in 1998, - it was a special display for Icelandic fighter Ace Tony Jonsson who was visiting at the moment (together with a busfull of drinking mates, hehe). I remember that the British Pilot's name was John Romain.
Anyway, here is a picture of the plane, and then old Tony sitting in the cockpit. Enjoy
