Another insurance scam you should bear in mind - when my firm stopped giving company cars, they gave us an allowance, to cover the cost of leasing a new car. But you didn't have to, so you could use the allowance and buy a "dog" and run it into the ground. That's what I did - a Citroen ZX turbodiesel, which I ran for four years until it began showing signs of tiredness (it had done 242,000 miles!). So I bought another identical one on eBay, intending to run the two side-by-side till I was happy the new one wasn't going to let me down big-time.
I rang up my insurers and asked them to put two cars on the insurance - identical spec - shouldn't cost me anything. I am the only driver on the policy and I can only drive one car at a time, after all. The guy on the phone sounded shocked - "That's not how car insurance works, sir!" In short, I had to start from scratch, with NO no-claims bonus, for the second car. The insurers refused to use the no-claims bonus on one car to assess the risk when I drove another, identical, car.
No-claims bonus is a rough-and-ready indicator of risk - no claims, good risk. It is not like bank account credit which you can use up. Why have punters allowed insurers to get away with this, because I can't possibly have been the first in this situation? And does anyone know a (legal) way round the problem?