I was thinking of fast A/B roads up to Stratford for a light riverside lunch/ coffee then head towards Bengeworth picking up the A44 to have fun up fish hill.
Then a stop at the rollrights stones (which I've passed so many times but not stopped yet!)
It's a good 150 miles all round from Berko so more for the southeners, but they are fast flowing roads, hardly used because the majority jump on the M40
It's all only a suggestion though, obviously it depends on others and if they want to stay more south!