Have you seen the Oxford traffic?
Never mind the Oxyford traffic. Have you seen it on the M40!
Try B&B lodging some of the week around the Garden City, you'll only be a few mins (against the traffic) from the airport and you could still drive one or two days if you had some reason to (like its nicer to go home than to a box ..)
h-r
NB My aunt lives on the GC, I'll ask her if she lets out spare rooms