We are seeing and this has been confirmed, that there is a current outage with BT Broadband at the moment

http://downdetector.co.uk/problems/bt-british-telecom

You can find the BT Service Status page here : https://btbusiness.custhelp.com/app/service_status/

BT actually cannot be blamed for this fault however it does point to their system needing more resilience!

Openreach have confirmed a major cable break in this area caused by a contractor working on behalf of a third party, unconnected to Openreach or BT. Specialist equipment is due to arrive onsite at 04:00 on 22/10/2016 to begin full restoration of services

Customers with Draytek Routers can failover to their 4G Wireless Dongles until the problem is fixed. Please speak to us if you would like information on getting one of these setup at your company.