Simon
How about the RAF at Odiham? When I was there (only a short while ago) we often had work-experience people there. One of my colleagues used to commute from Bracknell without difficulty; it may even be possible to arrange a lift with him.
Failing that, Farnborough is full of aviation-related companies. No idea about the transport situation though.
OBK
I think the Met Office is moving to Exeter soon isn't it?