I'm not saying they need to know every law and section of it word for word. They have to do a short course on the cycling duties, and how to perform them/what the law is. If he's working that shift, he should know whats what. Same with Traffic police, same with armed response etc etc. What happens if a copper in the armed response unit forgets his ROE. Alot more than just being made to look a bit of a cnut in front of a jumped up jobsworth twit! If he doesnt know what he's giving him a fine for, he shouldnt be pulling people aside for doing it.