Jabberwok- I've just checked the Chippy photo and it's a different one, same club though, Surrey and Kent. The one I'm standing next to, with a grin the size of a watermelon, (me not the aircraft!) has the number 20 on the fin- can't see the reg though. Red and white colour scheme.
I've just found another pic taken through the bomb aimer's perspex of G-XX and can see what appears to be a white, not silver, P51 with drop tanks and a cover over cockpit and engine, parked on the apron about 50 metres from the tower.