I read in a paper last week that there are hundreds of thousands of people in this country who have their phone conversations eavesdropped on. That is worrying.
On the subject of ID cards, look at the governments track record of computer systems that are inadequate, i.e. Tax Credits, Child Support Agency and the passport debacle a few years ago.
You cannot mention the words "government" and "computer systems" in the same sentence without adding the word "fiasco."
Also, if DVLA are allowed to sell drivers details to all and sundry, it makes me wonder if the same would apply with ID cards......