Last year a PPL on solo navex from a local field did a forced landing in a grassy area around Burnham. (must have been low when he was lost as we saw nothing on the radar!)
The instructor then phoned up to ask if he could fly in and drop off some fuel, and then fly out together. (He couldn't be allowed as SVFR in the London CTR requires standard separation if not on the Heli routes).
Makes you wonder.......