Hi Dicegirl. Would say 0730 is cutting it a bit fine for your first day. Unless you have done a reccy before. The busses can be a bit intermittant to say the least, plus you have to sign in at the security check point..the small portacabin hut next to the Hangar 6 car park barriers.
If you do get there a bit early there is always the lovely restaurant, where you can get a cup of tea..that opens at 0730!!