Thanks Daniel. I had to take them out as the site is live now and they weren’t working but if you want to have a look at them I can put them back on.
I have a mirror site for development, which still has them on ( members.ateb-group.co.uk ), and it works perfectly in there. That’s the most puzzling part, so I don’t think it’s a browser cache issue. The menu settings were the same exactly too. It’s been driving me insane all day.