Billing to High Wycombe. Take A45 to M1 J15, A508 towards Milton Keynes. South on A5 towards Dunstable. Right onto A505 Leighton Buzzard bypass. Left onto A418 towards Aylesbury. Take A413 out of Aylesbury and turn right into Stoke Mandeville. Pick up A4010 and follow to High Wycombe.
As far as I remember there are two R.A.F sites at High Wycombe.