In reply to Elizabeth_S:
I have used Summit since buying my first house 17 years ago.
At the time, i just needed Critical Illness cover (if I died, it didn't matter as I had no dependents, but I wanted to be able to pay off the mortgage if I was severely ill or injured). My mortgage broker provided a quote. I noticed it excluded exciting activities such as climbing. He got a new quote: the price went up a lot, but I still wouldn't be covered if I was injured whilst climbing!!!
So I went to Summit, who arranged a policy for a price somewhere between the two previous quotes.
Since then I've married and we've bought a house together. We have separate policies, arranged via Summit, that cover us for critical illness or death. It's around £50/month for each of us. The terms of husband's policy are not quite as good as mine (he is excluded from mine because he regularly climbs above E3). So yes it is expensive, but you have to weigh up whether it's worth it.
I don't think our mortgage provider requires that we have life or critical illness insurance. But for us, we don't want to end up homeless because we can't pay the mortgage due to severe illness or one of us dying for whatever reason.
Summit are good because they understand the different varieties of climbing, they will talk grades with you (hence the difference in our policies). We have a check-in every couple of years or so, when they ask whether we're still doing the same things or has anything has changed, and then they see whether they can improve the policy for either of us.