Jeremy
I can recommend Tim and the team at New Elms. I have used them since getting my 2000 4/4 a couple of years ago. I find that Tim is honest in his advice and doesn’t try to upsell just for the sake of it. I’ve had the Rutherford upgrade (plus kingpins and improved brakes) done there and it transformed the handling.
I’m a bit closer to Shaftsbury than you but it’s still a three hour round trip which I am happy to make for the service they provide (plus there are some brilliant roads around there).
All the best
Neil