There aren't any in Britain, they appear to be an American phenomena. The british climate is probably not really conducive to mobile homes, too much rain and northern europe in winter is probably also not ideal, too cold. The newer mobile homes are much better built than those from the 70's and 80's and better insulated. They may eventually catch on in Europe but it would probably not be cost effective to ship them from the US and there are no manufacturing plants in Europe at present that I know of.