As an older citizen of this country, I can well remember having an identity card and a ration card, there was no massive hang up about their existence as most people could see the need. The information on them was basic and easily forgeable, even later service identity cards fell into the same category. Even today, it doesn't take a mastermind to reproduce a driving licence photocard.
The subject of a new hi-tech identity card brings forth new problems or at least fears.
A driving licence type identity card with photograph and which contained name, date of birth, gender(?), national insurance number, blood group and identifying features encrypted on a chip would probably be acceptable to most people in the country. However, anyone who trusts this gov't or any future gov't to stop at that level is living in cloud cuckoo land, the man or woman who controls the chip controls the country. AND, find an expert in bank fraud to ask how easy is it for crooks to replicate your switch card, that's when you start to worry. There is information about most of us held on a multitude of databases all over the country, but the individual computers don't necessarily talk to each other, some do within an industry, i.e. car insurance but most keep certain information back and only release your name and address with your socio-economic profile (ask yourself why you get junk mail).
The introduction of a national card brings the day a little closer when one small group or coterie can access all the necessary information to rule the world.
The first paragraph of darth vaders answer is not so far from the truth unfortunately.