I don’t seem to be getting it anymore even though topics are marked to be watched. 
It wasn’t me!! I didn’t change no settings!! Honest guv’!!
We have moved to a new server and it may be down to the SMTP settings.
will have a look. 
Errr, it’s fixed now!! 
By the time I came home from work there was a whole load of notifications waiting for me!! Thanks to whoever fixed it. 