No first hand dealings, but I know he looks after the Harrison Collection and gets flown down to S France to service and maintain the bikes (of several brands) there. You can find both parties on Instagram
I sold him a frame and other bits couple of years ago , which he used to build a mad looking bobber / drag bike Hassle free transaction , nice chap and seems v clued up on Ducs and bikes in general
I've been in a couple of times- not had any work done on my bike but he was good enough to check over my front floating disks for wear last year. Defo seems to know his stuff and a really nice guy to chat with. Not aware of anyone else in this area with similar level of knowledge. I'd be happy to take a bike to him. Check him out on Instagram for some of his updates and also some tips he passes on.