I love this road really good either way round and always quiet because the M40 is just nextdoor. The section from banbury to stratford is awesome really fun road that has a mix of hairpins to big sweeping corners etc etc.
I would ignore the section from banbury to brackley its only short has cops milling about and isnt really that good.
Overall banbury-stratford bit is amazing really good way to spend an evening!
This stretch includes two really good sections one before and one after Banbury on the way to Stratfor Upon Avon. The first section is really good and has some nice medium speed bends and a good surface. And the second more westerly section is more rural but also an excellent selection of bends.. Recommended.