This route consists of two interesting sections, one near to Banbury and one near to Buckingham. The first is good if there's not much traffic about (i.e. don't go there at peak times) as the road is twisty and interesting with a good surface, it is quite narrow with double whites along most of it though. The secong section when the signs say follow Banbury is best, this bit is fast with open visibility and good surface
BBR-David