Yep, there's a definite route, I ran it yesterday, but looking at the map I'm thinking of cutting off one of the B roads early on that was proper bumpy and heading for an A road instead.
Bicester- head North B4100 up to A422 past Banbury up to Stratford for smoke/ sandwich depending on everyone's opinions.
Stratford- continue heading west A422/ A46 north onto A435
Jump onto B4090 north west and follow it to A441 now heading south, continue onto B4088 follow. That until roundabout junction of A44/ A4184/ A46, stop at services for everyone to catch up.
From here its 6/7 miles to Broadway (fish hill) A46 onto A44 and the real real fun starts!
We follow the A44 all the way through the very idyllic and at this point very noisy chipping norton and just before Fulwell we get onto the B4030, its all 70/80/90 degree twists and turns back to Bicester!