I can give you my theory...

Firstly the CCTV camera's.... i was reading up on this recently...

It appears CCTV got its first big success in the UK when the Bulger murder happened (2 10-13 year olds took a young boy and murdered him brutally) the murderers were caught thanks to some grainy CCTV footage. Not long after this the goverment offered grants to local councils that wanted CCTV camera's and thier numbers shot up, i think alot of councils saw it as a good preventative measure and a good way to solve crimes that after the original setup costs is fairly cheap to operate...

They saw it as a cheap way to reassure some people and a good way to collect evidence...

Most of the more recent stuff ID cards, and this kind of thing... is New Labour trying to appeal to more right wing minded voters, being tough on crime and the strong man is usually more a position associated with tory goverments but this Labour goverment has throughout its time in power (and since the early 90's under Kinnock) made a determined effort to seem as right wing as possible whilst still remaining the left wing party by default, this is how they have so successfully stayed in power since '97...

The problem is alot of natural labour voters, mainly left wingers are attached to the labour party due to the fact they have always been labour voters, they are/were the natural party of left wingers and appear less evil than those nasty torys to the left wing voter. On top of this they go for big bold right wing policys so the type of people scared of crime, terrorism and immigration can see the goverment is doing something about it, and it stops the tory's making the claim they are tougher on crime...

All of this combined with the fact that immigration and terrorism seem to be terrifying world ending things for some that they would happily give up thier civil liberties in exchange for...

Also it really doesn't help that the only party who does fight the civil liberties corner is our 3rd largest party... which is far small than the 2 major ones and doesn't seem like its going to improve that position any time soon...