How about putting ANPR cameras in all those empty boxes covered with bags that used to house speed cameras (and don't now for some reason). Stick a 3G comms system in them the same as smart electric meters to transmit the data.
Here is the capital of the North, there are lots and lots of ANPR cameras around the city - it's impossible to use a major route in or out of the city without passing several and they crop up on a surprising amount of other routes. Trouble is they just record passing vehicles, there's no enforcement, just "intelligence" gathering - largely of law abiding drivers who've got their car registered to their home address.
Da Fedz also have ANPR cameras on a decent number of their cars (not just the traffic ones with Jamie Theakston in) and 3 or 4 times a year have a well publicised crack down operation in the expected parts of town where they'll take a dozen or so untaxed / uninsured / unMOT'd cars off the road in a morning.
The rest of the time? If you're unlucky enough to drive past a police car and trigger the camera expect to lose your car - the rest of the time it seems that justice catching up with you is about as likely as winning the lottery.
Don't forget that a typical fine for no insurance is about £300 (I think there is a set scale for this now) - which is considerably cheaper than actually buying insurance for virtually everyone who'll think it's OK to ride round without it.
So if you are unlucky enough to get caught, just wave goodbye to that car and simply buy another cheapie and don't bother with VED, insurance or an MOT. It's cheaper than doing it legitimately.
How does he know they're untaxed as they don't have discs? Is that info publicly online?
As an aside some years ago someone parked across my driveway, blocking my garage. Their tax disc was out of date so I phoned the DVLA (I think, or maybe it was local police) and reported it, which gave me great satisfaction. I didn't want to use my garage at the time, I was just annoyed that they hadn't had the courtesy to - say - leave a note under the wipers saying "if you need me to move this, phone this number ...". If they did that now, I wouldn't know how to check.
As
@Phaeton says.
As regards blocking drives, if your drive has a dropped kerb, it's an offence to park across it and plod can and will turn out and tow the car if it's blocking you in (I've seen it done - although they may need a bit of persuasion to act nowadays)
