In reply to colin struthers:
To directly answer your question, should the BMC launch an 'independant forum', I think the simple answer is no. I doubt the BMC would want to take on the expense and overhead of running such a forum. Not that a simple discussion forum is massively expensive to run. It's more the overhead of keeping software updated, the forum moderated and spam free. The BMC would have to moderate it as well, it's impossible to run a forum otherwise.
To those who have said it would be impossible to compete with UKC due to the database of routes, I think you're wrong there. There are plenty of examples where a business has gone up against a entrenched competitor and done well. If you were to build a better forums, with integration to social media, better photo sharing, nicer features, so on and so forth, then you could do quite well. However once that's become enough of a business for you not to want criticism, then we're back to square one. Also obviously there's the other channel (UKBouldering) and the other other channel, Facebook. The biggest expense would be images really. Forum databases are small generally and I doubt a routes db would be massive either, as it would just be text. Image storage will take up a lot of space and potentially processing power. I'd be willing to bet that you could run the UKC forums off quite a small server, but that once you put the images in, it becomes a lot bigger.
I've been on the internet for a reasonable while, 15+ years, spent a while on usenet, mailing lists and a number of other communities, I've also run a small forum myself, which had a few hundred active members. In my experience, UKC is quite reasonable in terms of moderation. Generally folk are pretty nice on here and I'm always surprised by those who say that it's a horrible place (go and look on 4chan, b3ta, usenet or lots of technical mailing lists...). But most people don't get subtext on the internet and they've never been on a truly combative forum/mailing list. It's impossible to keep everyone happy with moderation, you'll always have some folk who say you're being heavy handed and strict and some who regard any moderation as evil.
A couple have said that 'ghost posts' would be a good idea, so that a moderated thread doesn't just disappear. They are a good idea, it stops the formation of 'where did my thread go' threads. The post can have a reason for the moderation as well.
That UKC have let this thread stay is pretty good for them. As noted, this is a business and it is not cheap to provide the various facilities that they do provide (easily several hundered a month (but as mentioned most of that is probably image storage)). It's not perfect, but it's not as awful as many folk make out either.