nickdearden,
Ask yourself the following questions:
1. What do the RAF do?
2. Where are they currently employed?
3. Why are they there?
4. Why do you want to join the RAF?
This is NOT intended to sound like a whinge. Far from it!! I am still in, still enjoying it and still feel that it is a job worth doing. You need to ask yourself the questions because you will be required to answer them during at least one of the interviews when you try and join. If any of your answers are "I'm not sure", then you won't get in. There will be a lot more, very searching questions to be answered and you need to be sure in your own mind that your answers are not just what you think 'they' want to hear but what you really believe.
If you are keen to join for all the right reasons, come on in.