Joining the RAF as a pilot
All good info so far, my advice is to get in touch with 'GAPAN', they can arrange a private aptitude test at Cranwell to see if you can achieve the sort of scores the RAF are looking for. It used to be around £100, well worth it.
As far as OASC is concerned, it is 4 days long and it gets fairly quiet after day 2 when a lot get sent home.