In reply to Dan Lane:
Just a note to say that you don't need a REC first aid course - just a 16hr outdoor first aid one.
REC and ITC are just qualification schemes and franchises, you can use one of the dozens of other providers (I won't mention the one I have a link to though!). It's like saying you need to learn to drive with an AA or RAC driving instructor.
That said, I can highly recommend Kath Wills or Helen Howe.