Bongo Fury

I have seen on the "Bongo friendly" garage fact sheet that there is a garage (GJB autos) fairly close to me here in Kent. I am thinking about changing the coolant and stat before I go off snowboarding again this winter, as it has not been done under my ownership this last year or so. Like many owners, I would like reassuring that these people are competent when it comes to the coolant change/bleed process, so does anyone have experience and/or feedback for me about this garage?, or if not can anyone recommend a garage local ish to me that are proper bongo savvy?, any help would be greatly appreciated.

P.S. passed its MOT this morning with only 2 minor advisories!!