Thanks folks - I did go back a week (I knew the thread wasn't any older than a couple of days or so). I was just thrown by the fact that I was looking for an ALL CAPS subject line, which had been changed to "title case" as explained by Joe above.

So I must've scanned down the list and not seen it, even though it was there, because I was ignoring anything that wasn't in ALL CAPS. The seraches I did failed because I used the wrong words (not being able to remember the subject text content).

That'll teach me to remember the text and not the case of the subject, in future :-)