In reply to Deadeye:
Mine!
In all seriousness, I don't know - but there are lots of busy teams outside of the 'honey-pot' areas who don't do so well from donations from the public. I don't know if MREW (umbrella organisation for England and Wales) or Scottish Mountain Rescue (the Scottish equivalent) have that kind of info, but asking them is probably your best bet.
I've been on two callouts today, for an injured walker and a missing biker; I'm happy to give my time but it's the generosity of people like yourself who keep us operational, so thank you very much for your generosity, whichever team you donate to.