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Governments are doubtless enthusiastic about their introduction given that they will then have access to exquisite details for every single journey undertaken.

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They pretty much have this already. I've been researching automatic number plate recognition systems recently and it is surprising to find that the police have a ANPR database, are scaling cameras numbers up to the high thousands and keep the data (not images) for up to 2 years and expect 50 million readings per day.

I think if you drive into London (from any direction) it is very safe to say you're tracked going in, and tracked going out.

However elsewhere in the UK it is much less common in general. There are entire counties where I'm yet to see a ANPR camera, just your regular old fashioned speed cameras.

At the level of a journey they already have a lot of coverage for that data with ANPR although this would increase granularity:

http://en.wikipedia.org/wiki/Police-enforced_ANPR_in_the_UK

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