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Where can I take a 'part-time' motorcycle mechanics/maintenance course? - motorcycle part finder

I live in Bristol (Southwest England) and I like the track that I understand the repair and maintenance will follow my own bike. I do not want a career where this thing is probably full-time in 3 years is not the best idea - something that I, in my free time.
Local universities do not seem to offer a bicycle mechanic training and I tried to Google some classes, but no luck ...
Suggestions?