@johnpoz
Hi Johnpoz
Thanks to you and all of the above for your replies.
I was seeing some very strange behavior which looked like some kind of corruption to me:-
Addresses were not being blocked even though they were clearly in a rule. Some addresses within an alias were being blocked while other were not. When I'd clicked on an alias it would open a different one to that clicked on. I tried a reboot to see if that cleared anything and during the pfsense startup my screen was just scrolling with errors of myriad description; file errors, device errors, api errors, version error and interface id errors ... ...
I have backups of my settings so I'm just going to do a rebuild and import, as currently I can't trust a thing I read. I'm guessing that was the issue all along and hopefully It will be cleared after the restore.
Thank for you help everyone.