Adam,
Depending on your age, location and what plans you have for Further Education / Higher Education, you might consider joining the Army Air Corps (Volunteers) before joining the Regulars.
The Territorial Army is losing 7 Regt at Netheravon due to defence cutbacks but still has 6 Regt, with RHQ and 677 Sqn in Bury St Edmunds and a second Sqn to be established in 2009, most likely at Middle Wallop. We don't have any reservist pilots - our role is to provide groundcrew augmentation to AAC Regts - but there would be plenty of opportunities to go on attachment to the Regulars and see the AAC at work. Being in f/t education you would be protected from mobilisation to Sandy Places whilst in the TA.
In fact, any TA unit would give you some exposure to the military way of life, though as in other aspects of life, some TA units are better than others...
Best of luck,
FP