or agravelation?Thank you every body. A consensus. You have saved me a lot of aggravation.
I consider the matter closed.
It's difficult to keep away from fast roads without quite a big detour.
You could go from Ogbourne St George to Mildenhall over Poulton Down (RUPP/track, but not very long), or go from Swindon to Barbury Castle, follow the Ridgeway to Hackpen Hill, then down the valley into Marlborough.