Take the M40 towards gerrards cross turn off for Beasonsfield - follow to Amersham and then to Great Missenden or take the right (forget whats its signposted to) - wander around and head towards Thame, Bicester (B4011 I think),Aylesbury or go towards Oxford and then head towards Henley and home.
Pretty nice roads all around there.
drop me a mail if you want something more specific or if I go out in Jan you coiuld come along!
sam