Security management Toolkit 
Story: Pilots ready to seek legal action over ID cards
Nope
The police officer should have very strong basement to ask some to show his id. That's where the civil rights begin. The state should have a good reason to stop someone and ask for something. The person should not confirm his personality to the any interesting official.
The institute of police exists on the taxes of taxpayers to let this taxpayers live safely not to be terrorized by officials. How to prove for particular person his citizenship? The IDs for immigrants brings IDs for natives. If you're native and don't have ID with you, you could be considered illegal by checking officer and you'll end your day in the police station "to check your identity". Take a look at the Moscow for example. If you doesn't look good enough for Moscow you prove your identity to every officer any day. Why? Because they can. And anyway it doesn't prevent terroristic acts to happen.
Before becoming police state GB should look at the "not so democratic" governments and their principles and see that it does not help. How many terrorists was arrested by checking their IDs on the street? Do you really think those ones who's responsible for 9/11 could be stopped in the airport by checking their IDs? Do you really think that all terrorists and criminals are foreign citizens?
Everything you'll get is control of government over law-abiding people. And you should remember that that "government" is not abstract thing - there are living people in it which have their wishes, needs and everything else what anyone wants. It should be considered seven times to really understand the powers that some people will have over other people and what you'll get in exchange.
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