I quite like CTC and not just because they namechecked SingletrAction loads in a recent article (http://www.ctc.org.uk/file/public/201305046-feature-making-tracks.pdf)
I suspect they’re probably the best bet for a co-ordinated MTB advocacy group at national level. AS well as them doing stuff it’s also about people finding a bit of stuff that they can do and then doing it. I quite liked Chipps recent editorial about “there’s no them to do trail tidying (or much else really) on behlaf of riders. Was a good point well made.
The lack of familiarity, confidence, expertise, perception issues, glacial pace of certain organisations etc all conspire to dampen the enthusiasm of the young-bucks (or even old) salts when it comes to trail or PROW issues. An inability to compromise or see matters from numerous perspectives, not just your own, are also obstacles to getting more trail done.
Don’t know how it all gets solved but just keep beavering away at bits and pieces as do mugboo, unkle, Paul and many others.
Of course, bloody volunteers falling out amongst themselves is a bit of a bugger as well 😉