I love this route. Combine with the A338 from Wantage towards Hungerford, and the B4000 from from the A338 back into Newbury for a triangle of fun: the Wantage TT!
This route is best ridden the other way, from Newbury to Wantage. It builds from town, through villages to open countryside with the climax over the Ridgeway through some great corners connected by long straights, all with amazing visibility.
Nice hill climb up from Wantage over the Ridgway with a couple of open, uphill bends. Thereafter a good mix of straights, bends and scenary