I strongly dispute that mate, as far as I know no powers given by any Parliament can trump Common law in this country and in Common law you can't assault someone unless "Self-defence (to the charge of common law assault) is available when reasonable force is used to prevent harm to self or another. Prevention of a greater crime or with the purpose of aiding a lawful arrest is also known as The Public Defence. The Private Defence or defence of property also may be used as an argument. These arguments are not strictly defences but justifications for a certain level of force." None of those apply to the Chief's Inspectors actions. He doesn't have any extra powers in this because no Parliament has the power to give him them. He's bang to rights here. He won't get charged because things don't work like that, but the Met will pay out on this one. Just like the Bible preacher a few months ago.