As charl said I was followed by a black Volvo saloon into a petrol station. I pulled in to blow up my tyres and the copper pulled across the back of me. Had a lil chat and turns out they are looking for a dark/black starlet reportedly DLAK'ing and almost running someone over. (Driving Like A Knob) He seemed cheerful realising I was driving sencibly. Also that I had tax insurance and mot. Basicaly just be cheerful with them and don't back chat. If you comply with them then they have no reason to be shitty with you.