WRT the current situation: I can confirm that my policy (at least) covers me third-party to drive with the owner's consent any car not owned by me and that car does not need it's own insurance. This was precisely the situation when my son changed his car. During the overlap period, he had two cars but only one insurance, which wasn't switched to the new car until he'd sold the old one. (He didn't drive the new car for the few days that took). After seeing claims that the car had to have its own insurance on this forum, I rang my insurers who confirmed that I would have the minimum cover required by law while I was driving. However, they did say that the car would be uninsured as soon as I stepped out of it.
IMO, requiring the car to be insured is yet another piece of legislation where the government has donned blinkers and not considered side effects. For example, the new rules unfairly benefit motor dealers. Most people have only one insurance, and so won't be able to overlap their cars the way my son did. So if, like many, you need a car to get to work etc. the new rules effectively prevent you from engaging in private sales.
Stephen wrote:
The way that they get there vehicles back is we give them a form to produce there documents at a police station, and the form is filled in and stamped then the owner or whoever the car belongs to goes along to the garage pays the fee to release...
I find this unbelievable. What Stephen is saying is along the lines of, "We impound your vehicle because we wrongly believe you have no insurance. You prove that we are wrong and then, even though we've got it wrong, you must pay for our mistake"

Surely, the only fair way of handling this is to require the police to compensate the owner for wrongly depriving them of their car (and possibly their livelihood).
Safespeed wrote:
I believe that seizure amounts to a criminal penalty. Clearly criminal penalties are supposed to be decided by the judiciary rather than the Police.
It appears that a criminal penalty is to be levied even if the accused is innocent

I share Paul's concern. Our justice system was crafted with important safeguards, one of which was to prevent "kangaroo courts". It did this by ensuring that no one person can be accuser, judge, and jury. This important tenet of a fair judicial system is absent from the law that permits the police to confiscate and destroy property without referral to a court of law. Now I'm not saying that the police would ever
deliberately wrongfully penalise anyone

, but people do make mistakes and there is thus more scope for wrongful punishment where the same person is judge and jury.
Stephen wrote:
... after all I only have to have reasonable suspicion to suspect no insurance and thats that ...
So, the police only have to suspect that there is no insurance (as opposed to have proof beyond reasonable doubt) and the rules say they can seize your car and destroy it. The rules seem to say that even if you have a certificate of insurance, should the police suspect it is not valid, your car can be crushed -
and it seems you have no recourse.
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AIUI, this all came about because the greedy insurance cartel wants to increase its profit. The new rules will put new business their way. Right now, the insurance cartel has more power to say who can legally drive what than does any publically appointed or elected body (such as Parliament or the police).
These new rules are just the latest piece of "elastoplast" to patch up the seriously flawed system of ensuring victims of RTCs are compensated. There is a simple, elegant solution (but the insurance companies won't like it!) and that is for the government to provide third-party insurance, paid for from fuel duties, for any activity that makes use of that fuel. (Boat owners, aviators, and lawnmower man would have to pay the duty, so it's only fair that they too benefit from the insurance.) How we insure electric and other alternative fuel vehicles would need addressing - but I'm sure that would be much less of a problem that the millions of drivers who are currently uninsured.