Boot,
Be yourself and don't bullsh*t, they are very good at seeing through it. If you don't know the answer to a question, say so. I know that they have had enough of the Sep 11 answer to the current affairs bit (part 2 of the interview) but there is lots more going on in the world. Read a good paper and have a look at time magazine (you library may have back copies). If you have a view on something then say so and try and have some knowledge of the RAF and the branch/branches you are applying for.
Best of luck
Tonks
