I didn't see your earlier post, 10CS and I would not have doubted you. I know for a fact this has been going on for some time. However...
"...officers can build a picture of a vehicle’s owner — where they visit and when they travel, whether on a commute, a motorway drive or a shopping trip."...
The important word is "can". They can build a picture. Whether they would want to and whether they do is another matter. The vast majority of the data collected is of no interest to the authorities whatsoever. They simply filter out what they are interested in. Whether they're interested in me popping down to Tesco's for the Daily Telegraph or going to visit my Aunt Ethel once a month is somewhat debateable. If they were my only concern would be their wastage of taxpayers' money.
"...what gives anyone the right to invade your privacy? "
As soon as you step outside your front door you no longer have any privacy. Anybody can photograph you, film you, make notes of your movements. There's nothing you can do about it. If you don't want people to know where you've been then don't go anywhere.
Anyone reading my posts regularly will know that I have little time for interfering busybodies posing as State employees. However, we live in very troubled times. If my being tracked going to Tesco's means the authorities can also track people intent on doing me harm then I'm none too concerned.