In reply to Jamie Wakeham:
(I have sent an email to Jamie personally about his quote) - BUT
Just for info, I have been in touch with Summit Financial services (BMC Website) and had a chat with the fellow there - he explained that some companies do not want to insure climbers at all and will do a big loading, which I found (Norwich Union and Royal Liver for a start).
I found that Standard Life and Legal and General accepted us at standard rates (we go caving too). That was for climbing every week indoors, four times a month outdoors in summer and a week in Spain type thing.
Might be worth checking these companies out to save time.
I guess the premium will depend on smoking, health etc but may as well find a co that will not penalise the climbing for a start.