Spent some more time looking into this problem today with success and now it’s working!
Looking again at the wiki I found there is a mysql test by going to:- http://x.x.x.x/fog/service/getversion.php
I got a message saying:- "A valid database connection could not be made"1.4.4
I went to /var/www/fog/lib/fog/config.class.php to find that there was a password that I had set in the setup, once I had cleared this password I checked the mysql connection again and it was working!