Thanks Janne
The diesel heating does seem to be a better idea, but the Eberspacher Combitronic is so expensive!
Incidentally I was looking for LPG garages in northern Norway and there is apparently one in Tromsų (Esso), although I don't know if the list was up to date.
I was looking at AutoSocks for the snowy conditions. They seem to work well, although I haven't seen a direct comparison with snow chains.
Mike