@daveo132When I used to own my Zed I did take it to Horsham Developments for the more serious jobs (oil gaskets, mapping, charging etc) but for smaller jobs and when it came to my MOT time I always used Pantbach garage in Cardiff.
They've since moved to a new unit from when I used them last but just looks even better now from their website. Lee was the owner when I used them and was always happy to help.
Link: https://www.pantbachautomotive.co.uk/contact.html