Lots of UK RHD cars ahve gone to the continent - mine did and I know of a few others that have, so if you want to extend your search you may well find cars for sale in Europe too.
however, there are never many for sale at one time, so best thing to do is probably speak to a few dealers (check the MMC website and see there who is selling what and which dealers are close) and put the word out you're looking for a car..
