I've not flown in/out but I used to be local. The locals are mostly loaded and VERY touchy about GA. I'd suggest a call to ascertain circuit procudes and where to avoid overflying - I also believe they have limited movements required as well, so PPR is prob well-received if done initially by phone.
When you fly in sight of Wisley (the closed field with OCK VOR on it), shed a tear for such a marvelous looking expanse of tarmac having fences across it to deter even an emergency landing!
Enjoy sunny Surry
Hersh