My side Orange Peel Morris, Ontario Canada, will do it for 200$ Canadian, plus beer, food, accomodation and travel expenses.
There again, we don't do Cotswold, and some of the men aren't.
We could probably get about 20 dancers and musicians out so you can do the math.
If you don't decide to go with our team, good luck finding someone more locally.
You mention Oxon above, when we visited England in 2004, we danced with a mixed side called Oxon Hundred who do various styles of dance.
Good Luck and Good Choice of entertainment, JohnB