| I've had a few Cat Cs, my current S2R was advetised as Cat C but then It turned out to be Cat D.
Often its something like a scratched frame that makes it Cat C or a lot of bodywork or front nd damage.
Not sure what the current deal is on Cat Cs, but previously I just had to apply for the log book. The most it would be is a MOT and possibly an inspection, mainly for checking engine & frame numbers against paperwork
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