I have no problem whatsoever with I.D. cards, I carry my driving licence with me at all times anyway. I also wear my two I.D.'s at work, one of which has my DBS number on it, so 'they' already know everything about me. The other card is a University issued proximity card for door access, cashless vending, library use etc, so they also know where I've been too.
I just don't understand the paranoia around national identity cards and find it baffling, unless of course 'we' are a nation of criminals.