Ok, Bob, where in England? My Chinese Elms as I said previously, are outside. They have no protection at all, and stand pemperatures to -10C and lower.
They come from a part of China that has harsh winters. You can if you wish put them under a bench to keep the rain off a bit, Mine does not drop leaves until spring usually, but that does not mean others won't.
Have a look at bonsai4me.com this an English web site and has species guides etc and is one of the best there is.
Geoff.