notice: change to commenting settings

We've been having a bit of trouble with spam comments making their way through the Akismet spam filter recently, so I just wanted to let you know that for a little while the discussion settings will have to be a bit stricter than we'd like. Once you've had a comment approved, you should be able to comment without moderation thereafter (provided you supply the same identifying details).

Please do keep commenting on our blog - we'll approve genuine comments as soon as possible.