Find the name of your Air Cadet Liason Officer at the base you want to visit. Unless you are in the Air Cadets, you'll not get a flight- too expensive on insurance...
PM me with the base you are interested in if you have no joy... but, prove your worth with initiative and find it yourself. Failure is weak!
And get a book on which aircraft we have- the "vomit comet" is not on our inventory, although some people I've flown with could turn anything into it, even on IRTs...
SB