Leaving the plate aside for the moment - a price for the car is going to depend on a huge amount of factors beyond mileage and number of owners - it's value will be based on service history, condition of the body (ie rust) and engine (it's more than possible for a low-mileage car to have plenty of issues either from lack of use or the kinds of miles covered), interior etc etc. These cars are rapidly appreciating modern classics so assuming it's been garaged, has good service history, no rot and has been pampered, you're probably looking at about £1500 to £2k. The numberplate is tricky - there are plenty of online valuation companies that will be able to give you a rough idea of what it's worth. As always with private plates, it depends on finding the right buyer (normally with the right initials).