Lots of speculation about the aircraft, but very little hard info ... so I went for a drive.
It is a Vampire FB.6 in Swiss markings, serial number J-1169.
I have done some research into this aircraft, and it was formerly displayed at the main gate of Samedan Airfield in Switzerland.
Looks a little out of place in Henley!
I have a few (poor) photos, taken with my camera phone.