In addition to the already announced Club Tour to Newbury from 3 to 5th September there will be an off road option for Friday and Sunday, and possibly Saturday too. The idea is to start from Swindon (there are trains from Gloucester at 7:05 and roughly every half hour after) and follow King Alfred’s Way to Reading, doubling back to follow the Kennet & Avon Canal to join the road riders in Newbury. The route is https://ridewithgps.com/routes/37111064 On Saturday options are open then on Sunday the return to Swindon will by this route https://ridewithgps.com/routes/37114478 which joins King Alfred’s Way near Amesbury.
Take a look at the web site https://www.cyclinguk.org/king-alfreds-way to get an idea of what to expect and Contact the President if you are interested in joining this ride.