We have identified the root cause of the issue and resolved it.
The fix did require a further reboot of the VM Firewall in Manchester, but everything is now back up and running.
We will be closing this status, but please call our Helpdesk on 0345 145 1234 if you are still having issues getting online, and the team will be happy to help.
We're sorry again for any inconvenience this has caused you this morning.