Thank you.
Syncing seemed to be working this morning but I tried the tests in the links anyway just to be certain.
I was failing at Test #2 with a '400 Request Header or Cookie to Large' error.
My Hosts file was ok so the above error prompted me to delete all Cookies from the browser and now I pass test #2.
It is very strange that I had to delete the app on both my iPhone and iPad to get them to load any images.
Currently synchronisation is working but I will save the link just in case.
Thank you for your help.