I'm far more bothered by this being yet another nail in the coffin of web forums. The issue is the burden the regulations place on any site which hosts user-generated content. For small low-risk sites the burden isn't all that great - OFCOM have some guidance on their website - but it's still enough to be offputting. A 100-user web forum isn't going to want to bother with it, so those run by UK nationals are just pulling the plug, while those run elsewhere are just blocking UK users because it's the easiest solution.
Which reminds me, I should go and disable comments on my blog...