It's great to see a skeptic forum in the UK - I have been lurking in US-based skeptic sites for ages, and was wondering where all the sane people in this country were!
The most coherent attempt I've yet come across to create a unifying, positive skeptical identity is http://www.the-brights.net/.
Do you find this helpful?A bright is a person who has a naturalistic worldview
A bright's worldview is free of supernatural and mystical elements
The ethics and actions of a bright are based on a naturalistic worldview