glasgow182 said:
just a note - but its illegal to insure a car you are not the registered owner of !
No it's not, you just have to declare that you aren't the registered owner! It's frequently cheaper to insure if you're the registered owner, but not essential!
With regards to the GAP insurance the policy is against the car, not the driver so if the car is written off the GAP pays out, just send through the final valuation notice from the main insurer and the money is yours!
I've had GAP insurance on my last three cars, especially after I used it on the first of those, it saved me £2,500......