It appears that comments were turned off on several posts for no obvious reason. I assume this was due to the problems I was having with WordPress with endless reloads of some posts etc. These have now been fixed and opened up again. Apologies to anyone who wanted to post but could not.
On a very different note, I realised that a couple of weeks back I passed my 2 year anniversary of blogging on WP, and the 3 year anniversary of blogging in total is up in September. Wow, time flies.