So, background, Moved back to TT & once the service was up I changed things to match my previous supplier's setup - I changed the DNS servers from Auto to Manual & added 184.108.40.206 & 220.127.116.11 - I changed the Firewall to 'Custom' and added a rule for the ports I wanted to forward - I added port forwarding for the same ports - everything worked fine including the port forwarding.
I thought I'd try changing the DNS servers back to Auto - everything seemed to work ok except Facebook & Dropbox - the message I got on my browser (this was trying Facebook) was Error code: ERR_SSL_PROTOCOL_ERROR.
So I tried a number of devices, Windows, Android, IOS but none of them would connect - I rebooted all devices no difference - flushed the DNS cache on the PC, no difference - I rebooted the TT router, no difference.
So I changed the router back to Manual DNS 18.104.22.168 & 22.214.171.124 and everything works properly again - Anyone any ideas?
Sorry, I don't know what would be causing this but I'd suggest resetting the router to factory default settings if you haven't done this already