What's this about patch clubs/MC/MCC?

Patch clubs are clubs like the Hells Angels who wear their patches ('colours') on their backs. These clubs also go for the MC abbreviation rather than the MCC abreviation for Motorcycle Club. So the Enfield Ripfarter Classic Motorcycle club would be the ERC MCC, while the Slavering Wolvehounds Who Kill And Maim For Fun Motorcycle club would be the SWWKAMFF MC. I'm not sure anyone takes any notice of this MC/MCC too much, but you are very likely to get in trouble if you wear a back patch.