Satellite tracking of cars -- "when, not if"

The BBC reports that a govt appointed committee is considering fitting a tracker to every car in order to introduce congestion charging on all roads. Professor David Begg, leading the committee, is quoted as saying:

It is now a matter of when, not if. Six months ago it was on the shelf, but Mr Darling is now very serious about it.

It seems the day when everyone is under constant surveillance 24 hours a day no matter where they are or what they're doing is getting closer. Satellite tracking of cars, plus ever increasing usage of CCTV (still largely unregulated), plus agencies from MI5 to the Charities Commission able to monitor internet and phone activities, plus govt powers to spy on bank accounts, plus an ID card system tracking our usage of govt services and quite probably our purchases or movements, gets us pretty close to that day already.