I route I use for some advanced training taking in some rural 50s then pushing onto some really nuice rural nationals. Points of interest along the way:
Avebury - Some lovely bends, a nice pub and some big stones. Well worth going through twice.
Hackpen White Horse, Alton Barnes White Horse and the Uffington White Hourse
Wantage - Couple of nice cafes there for a brew
Mostly B roads to get you working hard. The Wantage to Swindon rd past the Uffington White horse is brilliant
A fast and twisty route to Swindon, just have to watch the road surface as there's pot holes a plenty near Wantage and risk of gravel and manure on the roads. All leading to a nice challenge if you're winding ot on a bit.
Some decent country road riding. A fair new 50's but you can generally get a lick on. Lots of scope for over takes. Flowing rollorcoaster roads between Upton and Streatly