I know you have a medical at the start of your application for the RAF, but you have another one at the pre recruit training course will they just do the same things as the first medical you did or is it more attention to detail this time?
Where did you get the information that you have a medical at PRTC? You don't.
You'll have your medical at the start of the application process and that's it, you're then deemed fit for service.
You WILL have a further fitness test at PRTC, which is pass/fail. But that's to make sure you've maintained your fitness levels between your PJFT and Halton. You're not in the RAF until you start phase one, so it's important to maintain your fitness level.