For the last two bog posts there has been a glitch with my website software which sent up to ten copies of the same blog post to some unlucky subscribers. (One of them emailed me to say: “the content is great, but once is enough”. Quite so.)
I spent some hours last night reading through pages of code, and I think the spamming problem is now fixed. I certainly hope so. (The problem, if you are interested, was a hyperactive WordPress Cron function.)
Please let me know if you have any problems with the email list. If you want to stop getting the emails, there is an unsubscribe link at the bottom of every email.