We are starting to get reports of broadband users in various part of the UK unable to reconnect to the internet if they become disconnected. BT have advised us that they are aware of the issue with authentication, but do not yet have an estimated time for resolution.
We would advise that users first try a 15 minute power off of their ADSL router
Swift Internet NOC 
We are seeing most users who were affected have now reconnected so please reboot your ADSL router if you are still unable to connect.