Do you have to be 18 to do the Conville Memorial Trust Scottish Winter Mountaineering course? It isn't in the 12-17 section on the Plas-y-Brenin website, but it also doesn't mention age ratings in the description: http://www.pyb.co.uk/conville.php
In reply to oliverg:
I did one of these a few years back and everyone on it was over 18. I think you need to be, but not certain - why not drop the guys at PyB an email? They'll be able to tell you for certain.
Isi