Police constable Andrew Rawlings is used to getting heckled while trying to maintain law and order at environmental protests. He's not so keen on the guy shouting the insults being his flatmate, Ben. A protest is no place for a well-mannered school teacher, even if the guy is built like an ox. That's why Andrew expressly forbade Ben from attending it, and Andrew isn't used to his commands being disobeyed.
Ben has had enough of being bossed around by his best friend. He's a grown man. If he wants to protest against the new motorway, he will. And, if Andy Rawlings doesn't like it, well, he'll just have to step up to the plate and start playing the dominant role full time, not just whenever it suits him.
Nudity, spanking and ball gags -- the punishment for civil disobedience has never been so much fun.