I wouldn't pass up the chance of a visit to Boscombe Down if you can get it. Whilst it isn't front line it does have loads of sqns stacked full of really experienced guys, most of whom are recently off front line tours. It has the Empire Test pilot school, an Operational Evaluation unit, FJ, Multi and Rotary Test Sqns, aswell as a UAS so there are bags of people to meet.
They should be able to give you all the info you want before OASC.
Good luck!