Here was our problem - I'm not sure how this had happened but somehow the creative cloud had started using the wrong login - we had to click the 'X' to close and then when it asked if we wanted to cancel say 'No' and then click the cancel button.
Here we could see that the wrong username was being used - why it never times out is another question...
Then there is an option to use a different Adobe ID for sign-in and so we changed the Adobe sign-in and voila!