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The IFC said the smoother power supply made it possible to expand output and hire workers.

Russian strikes on Ukraine's power supply have caused widespread blackouts throughout the war, leaving thousands of people without heating in the cold of winter.

It follows a substation fire in Hayes, west London on Friday, which knocked out the power supply to Heathrow Airport and triggered its closure.

"West London is one of the best locations in the world to invest and we've got people that are standing by wanting to build new homes, wanting to build new industrial sheds, Heathrow wanting to expand the airport - but none of that's really possible without a decent power supply," Mr Dakers explained.

Mr Woldbye told the BBC the delay to reopening was due to the need to "reallocate" the power supply - "closing down and restarting systems which takes a long time."