...remember when policemen were people you felt you could go up to and ask for directions?

No longer it seems. In fact, if you have anything like a map with you, you could find yourself staying at Belmarsh (warning, watching the whole of this may cause you to damage your computer in anger!):

H/T Tristan

I am so glad Terence was filming this. Everyone should get the chance to see this kind of thing and have a real good think about the "if you have nothing to hide, you have nothing to fear" attitude that is allowing our country to become a fascist state. The ability to stop at random (I was going to say "take to one side", but clearly they're happy to do this in full view of the entire concourse), with no probable cause whatever, and humiliate them in order to show other passengers "look, we're doing something about your security" is utterly obnoxious. I must say, though, I am amazed that he was allowed to continue filming, considering all that has been going on about photography in public places.

Britain, like never before, needs Fourth Amendment rights enshrined in law: "The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."