Are you time limited Colston? I'm just thinking you are dealing with fairly slim pickings on the Birmingham side of your corridor. But Worcester appears to be a fairly regular touring venue for TS.
If you can find a touring escort that ticks the looks boxes it can't hurt to drop a mail to see if they are visiting Worcester / Glos / Chelt anytime soon. If you are looking with a particular (nearby) date in mind your chances are reduced.
As always, it's absolutely key with TS to detail all of the required services and what you expect that each individual will do and have what done to them.
I don't know if anyone can give the viewpoint from the Brizzle side of this equation.