My December 200 (Kings, Castles, Priests & Churches) uses the route from back from Wormelow Tump to Tewkesbury, so if you want to get some advance route experience of part of Steve's route - get an entry in PDQ.
And my September 200 (Mr. P goes to Hay in a day). goes from Tewkesbury through to Wormelow Tump, so if you've done this ride you'll also have an idea of the ride the other way.