Check your Internet service providers (ISP) Status here (list of common broadband providers)

Broadband provider Page
BT business https://btbusiness.custhelp.com/app/service_status/
BT Home https://www.bt.com/consumerFaultTracking/public/faults/tracking.do?pageId=31
Demon Internet http://status.demon.net/
Idnet http://www.idnet.net/support/networkstatus.php
Namesco https://www.names.co.uk/network-status
Madasafish http://www.madasafish.com/support/service-status.html
Plusnet http://www.plus.net/supportpages.html?a=2
Sky https://servicestatus.sky.com/#/uk/issues
ZEN https://status.zen.co.uk/broadband/
Talktalk https://community.talktalk.co.uk/t5/Service-Status-Dashboard/bd-p/service