ID cards to beat terrorism, again..?

IDENTITY cards are to be brought into Northern Ireland, as they will be in the rest of the UK. Part of the reason given is that they will help fight terrorism. I don’t want to burst the Home Secretary’s bubble, but we’ve had photo ID in Northern Ireland for many years that didn’t exist in GB (eg photographic driving licenses). Can he tell us what difference it made before he repeats the exercise? What do readers feel about having to carry ID. Would you be happy with Big Blunkett watching you?