I'm old enough to remember when my colleagues were vigourously expressing concern about the potential for Oyster cards to be used to track who was protesting where.
What remains astounding about the UK is how few people benefit from this enormous scale privacy invasion. David Cameron, while leader of the opposition, managed to get his bike stolen twice, and neither time did CCTV being literally everywhere help to find who did it. Given things like that you really have to wonder what is all the surveillance for exactly?
I’m sure we can find a better anecdote than a bike being stolen…
Omniscient government surveillance in practice will be of far more use for harassment and suppressing political dissent than it ever will be used for the public good.
Did that risk materialise? I suppose it would be only the same as credit cards. With a valid warrant authorities can gain access to information. But that's within a legal system designed by an elected parliament. I'm more concerned about ensuring the legal powers are checked and balanced, and stay that way.