Well I never joined GLASS but due to rumours and other goings on I have joined http://www.allterrainuk.com/ The seam to be doing the same job as GLASS but in a transparent way.
They organise to help with clearing of routes and helping councils do this, laning trips and meets. I highly recommend joining.
Quote from their FB page.
So… we’ve come a long way since the days of the East of England Glass group, but we remain dedicated to protecting our vehicular rights of way network and maintaining our rights to use them as intended. We also recognise, probably above all else, that responsible green laning should still be enjoyed - we do it for pleasure - sadly, many of our contemporaries appear to have lost sight of this fact.
All Terrain UK is an organisation which aims to better represent today’s 4x4 green laners, we will be open and approachable to our members and be accountable for our actions. With your support we can become the only credible organisation that truly represents the interests of recreational 4x4 users.
Please take a look at our website http://www.allterrainuk.com and consider becoming a member.