I believe that if you are not permanently importing the car to the UK then it wouldn't need any special Customs clearance (after all, you wouldn't need it if you were driving here on holiday). I've imported several cars and haven't needed to pay any Customs on them.
My son has a business which restores Morgans and would be happy to help/do the restoration. Try
www.langleyclassics.co.uk and/or email him james@langleyclassics.co.uk
