The comments on this blog are usually not open to all users, simply because of the amount of spam that turns up. Apologies to anyone who is thwarted by this system but it's better than readers having to wade through 200 spam comments. If you would really like to comment but are being thwarted by the security steps, please email me and I'll adjust them.
Also, I don't take questions out of the comments - i.e. if you ask me a question in the comments, I won't answer it. It's just a thing and I'm unlikely to get over it, as the kidz say. You could email a question to me, though!