I just posted an answer and it said "thread could not be retrieved". Big Bro is really on the ball this week.
I had three e-mails from AB Editorial Team to tell me that I had subscribed to a thread three days ago and that if I found the e-mail useful I should acknowledge by saying thank you at the end of the thread. Or unsubscribe at the link given in the e-mail, The link doesn't work, and I am not aware of subscribing to that particular thread. I suppose I'll be collecting Ab e-mails from now on.