nigel,
if you PM jerry meislik, he might be able to help you. he lives up in montana where it is COLD in the winter. and i know he keeps his stuff indoors. there is an article on the
Fuku Bonsai site about how to do it indoors permanently, but their site is not up right now for some reason. they also have an excellent article by someone else about how to grow tropicals indoors. ill try to post the exact link later. in the meantime, you might want to check out mr meislik's
website website.
i have one of these guys, but i keep it outside permanently so i cant really help you.
jeff