Andy,
I know that the BSAC Accessibility Officer Mike Halligan has mentioned the Social Model in preference to the Medical Model in discussions on the BSAC forums. However I have never heard of the six strands of diversity. It could be that they are built in to our methods without specific mention - I have no idea.
If you want to discuss anything related with him, you can contact he either via the
BSAC forum or
Diving Group - BSAC
Adrian