Here are some other suggestions for HD moving snow fields:

http://www.youtube.com/watch?v=BJdJ1uHmbzw

Mother Earth 5-blu-ray IMAX collection
Alaska: Spirit of the Wild
Great North
Antarctica: Adventure of a Different Nature
Imax Antarctica (same disc, but maybe cheaper prices)
The Alps

I say just look for anything snow related with Imax blu-ray releases or even some of those blu-ray "moving scfeen saver" type discs (usually involving Hawaii, fireplaces, aquariums or the like).

Also, if you decide to purchase these directly Ady, you coudl always email the sellers on Amazon.com to see if they will ship to the UK (since it looks like the prices on amazon.com are cheaper than those on amazon.co.uk)