Dunsfold is indeed still there.... I live about 2 minutes from it
It has a function now as the Top Gear test track....... although the runway is still in extremely good condition. There are rumours that it will return as a fully functioning airfield sometime in the not too distant future, but I'm not sure if thats just wishful thinking
If you fly over it you can see the runway numbers are sometimes there and sometimes the cross is painted on the threshold in their place