You mean something like this?
"The G A Alliance is a group of organisations representing, as far as possible, all UK General Aviation (GA), and Sports and Recreational Aviation interests (S&RA). Its objective is to co-operate and consult with government departments and other relevant organisations to support and progress these interests.
The G A Alliance was formed specifically to address airspace issues and matters of common concern to GA and S&RA. Activities are progressed with the agreement of member representatives through facilitation. Our objective in representation is to establish a joint common position which all members are content to sign up to recognising that the various sectors will also often wish to present their own specific position and arguments in many consultation and Aviation forums."
What it does not say is that AOPA insist on rowing their own boat - and usually in a different direction - see recent issues on training from unlicensed airfields.
But it is coming at last, see also in an EASA context European Airsports.