Hi Ishan, yes I am referring to the bottom right hand corner showing on the task bar -- I thought this was called the system tray. The Windows Updates icon WAS showing, then suddenly disappeared. At the time, there WERE important updates waiting to be installed, which I subsequently have installed.
I will however now wait for a week or so to see if the icon reappears when new updates are ready... it is of course always possible I am just being completely stupid about this and that the icon disappeared AFTER I started the update process... I don't think so, though.
Many thanks.
NOEL