More than 20,000 UK homes were affected by a phone exchange fault tonight.
BT said customers in northern England and part of Scotland were experiencing disruption to their broadband service following a power cut.
Engineers were working to resolve the problem that hit an exchange covering the Edinburgh and Tynecastle area.
A BT spokesman said: ''There's an issue with a node in Edinburgh and we've sent our engineers to deal with it.
''It's affecting a significant part of the UK.
''We've diverted engineers to Edinburgh to fix it as quickly as we can.''
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