Ian,
See the LEJOG post.

Myself and 15 other people are attempting the National Three Peaks Challenge on June 30th/July 1st this year (2012) and I would be interested to hear from anyone who has attempted this challenge: the highs and low points especially. We are all attempting this challenge for charity - every walker is doing it for their own individual charity - and we have a meeting arranged on the 15th April. At that meeting I would like to present the group with ALL the facts about the challenge and let them know exactly what to expect. Also as we are doing this challenge on our own - how do we validate those who actually complete it? Many thanks in advance. Ian