Re: A visit from the law...
Nick, I can understand what it's like.
When I was at University I discovered that my housemates had been saying all sorts of horrible things behind my back. Unfortunately I wasn't in the position where I could move out so instead I simply didn't use the communal areas for six months and removed all of my 'useful' appliances from the communal areas - including the TV decoder (that was a brilliant move).
The easiest way to fall out with people is to live with them. At least your dinner isn't sandwiches at 10PM because you don't want to use the kitchen!