You sure can. Just login and go directly to Swap my car.
With a few quick clicks you'll be able to change the old car for the new, and keep the same policy.
If your new car costs more to insure, we'll ask you to pay an additional premium – if it costs less, you'll automatically get a refund.
If you’re not swapping cars, but getting an additional one check out Can I insure an extra car? to find out how easly it is.