Ahh - gentlemen, there you have me. Corrected as being the Horten HO.IX.V1 - also known to all and sundry as the last card in the Axis pack as the Gotha Go 229. Sorry for the repeat.
Well done to EvansB who picks up the baton, and to another who PM'd me and was also entirely correct.
A friend laughingly suggested a P.. and a F... But wait - they haven't been done! Will try to win again - what a good thread. (Sorry about the Spitfire cockpit flame..)