sites failing to load because of too many redirects

Hello,

All the sites in my network are failing to load and giving the error too many redirects.

Sites.bishopg.ac.uk
Sites.bishopg.ac.uk/test
/drama
/Celt

I have a session logged in still open and the pages load then but not in another browser or incognito mode. If I edit a page on a site then it seems it will work again for a short time but then the issue returns.

Any help with will be most appreciated. WPMU access is turned on but wonder if you will be able to access the site given the issue.

Thanks,

Ben