Your motor insurance policy may cover you when driving another person's vehicle that is
not insured. Should you damage this vehicle your insurance policy may cover you.
The "excess" or "first amount payable" is the amount you pay
each time you claim. These can vary substantially between insurers. If you are accepting
higher excesses, you should be getting premium discounts.
You insure your new vehicle for it's replacement value in the first year.
Thereafter, you insure your vehicle for it's market value. Adjust your sum insured
annually to it's market value to make sure you pay premiums on proper value.