There's an organization called ASLaN http://www.geniusloci.co.uk/aslan.htm
(inspired by Andy Burnham? Not sure)
which is of good intent but includes EH and NT in their membership and I'm not sure they achieve more than the promotion of general goodwill towards sites, (though I'm happy to be corrected). I think it tends to prove my point absolutely that a Lobby group separate from the Establishment is sorely needed.