Suggest you ring the OASC casework office on 01400 266717 or 01400 266718. However, bear in mind the following when you speak to them:
VW is a personal decision that you will have been counselled about at each level of the command chain in OACTU and offered the opportunity to change your mind.
The RAF is downsizing and has probably more than enough applicants for pilot, with strong aptitude, and younger than 24 too!
Do your pilot aptitude scores mark you out as a "must have" low-risk option for the RAF?
Also look at it from their point of view and prepare your answers well to:
You were given your chance and you chose to release yourself from it.
What gaurantee has the RAF got that you won't VW again?
Glad to be of help.