In reply to Wibble Wibble:
The saving depends entirely on what cover options you want. Snowcard gives you a lot of flexibility on what you want covered. BMC package more things together and in a different way - so you take your choice.
I saved about £100+ on a worldwide annual mountaineering/trekking policy. I don't want possessions cover (obligatory on BMC last time I looked) and cancellation cover (ditto). I'm going to ski, but only for a week at the most.
My possessions are already covered on my household insurance, I'm quite happy to risk cancellation on a cost/benefit analysis.
What I really want from mountaineering insurance is to know that I will get carted off if I have an accident anywhere in the world, and have medical costs and repatriation covered in a bombproof way.
That's what I've got for £112 a year with Snowcard. Someone please correct me if I'm wrong, but that looks like £214 plus membership costs on the BMC scheme.