Originally Posted by jonathan7
Example 1. When at uni, a police officer strolled into the pub we were in and very aggressively asked what my name and a friends name were (the two of the group who had shaved heads). I refused to give my name, because he hadn't asked in a suitably respectful manner; and told him thus. He failed to asked respectfully so I didn't give him my name. Of course what really amused me, was this cop was such a moron, that just asking for my name (and no ID) meant I could of said I'm Joe Bloggs and he'd of been none the wiser.
You don't have to provide any information unless he gives you his name, department/police station and such.
When a policeman says jump, you ask for his information.