Just so people know what's going on, on behalf of BCA I rang AMEX yesterday to discuss this. The lady on the phone was not able to confirm that self rescue would be covered - she said someone would get back to me about this. I pointed out that if BCA are going to recommend the AMEX scheme as covering all the risks we know our members want cover for then we would need something from them in writing to confirm this. I gather that might turn out to be a problem.
I've heard nothing from AMEX as of 24 hours later, but I have also been speaking to Snowcard who seem to have a much better grasp of what we need.
I will report more as soon as I have something definite to say. In the meanwhile, if you are going to buy the AMEX cover for caving I suggest you ring them to confirm that the activity which you are planning will be covered, and make sure you keep notes of who you spoke to and when, and what they said. I'll happily act as an independent repository of those notes if you want to send me an e-mail or a PM recording the conversation.
Nick
(BCA Insurance Manager)