Nick
If you have only done the aptitude tests once before you will have to do them again. Only your highest score will count. Most people do improve the second time they do it and there is no point in missing an opportunity to get an even more competitive score if you can.
Can I also advise anyone applying for pilot it is probably a better idea to postpone Cranwell visits till next April if at all possible - OASC have already assigned over 75% of pilot places for the year due to a mix up in figures last April.
Good luck to you all!
Minstral