Please note that there is a UK wide BT Wholesale issue that is effecting a multitude of broadband lines.
Consequently this means that your internet will be down and if you are experiencing issues today, that would most likely be the reason.
We are liaising with our ISP Partners and updating our clients accordingly every 30-60 mins with progress reports.
BT are not able to provide resolution times but some indication is set out on their service status page.
The BT service status page: http://btbusiness.custhelp.com/app/service_status/