Wisley was NEVER RAF! it was 'discovered' by a Vickers test pilot out of Brooklands when he force landed there; Vickers needed a larger airfield than Brooklands to develop the Viscount and Valiant so they bought the land and developed the airfield eventually building the runway which is still there. It was used by the British Aircraft Corporation who took over Vickers up to about 1973 when it was closed, the runway presently having Armco barriers across it at two points where public rights of way cross it.
Being a good visual landmark and a VOR/DME outside controlled airspace, it tends to be a bit of a 'honeypot', and is also used by traffic departing from or inbound to Fairoaks, some 3 nm north west.