James, do what you want to do, OASC will give you a hand in deciding but read the magazines, papers etc to work out what you want to do in the Service. My kid bro is a Hercules guy and he did Oceanography at Southampton too, I also fly - try not to listen too closely to all the comments, some guys on here were last in the Service in the 1950's, so be careful, if you need a hand - PM me.