Just found out what’s going on …
WordPress are having a problem and have switched someting off in an emergency sory of way. Hopefully switched on again later today.
I’m not going to be much help Karl except to say that I’ve had the same problem.
It was all OK yesterday.
Most posts aboput this on the web seem to be referring to self hosted wordpress sites not to those hosed at wordpress.
I wonder if someone there has recently upgraded anything?