Due to a very high volume of comment spam, I’m afraid that I have had to temporarily suspend adding comments to older articles on this blog. You can still add comments to articles which have been posted here in the last 40 days: please feel very welcome to do so.
I intend returning this setting to normal, allowing comments on all articles no matter how old they are, on Monday, in the hope that the spammers will have gone away by then.
I apologise for having to do this, and for their unacceptable behaviour.
Update: I have now enabled commenting on older articles again. Let’s hope the comment spammers have gone away again.