Islington Council has announced that it will capture wast heat from London Underground tunnels and electrical substation help warm homes and cut energy bills, in the first project of its kind in Europe.
London Underground generates large amounts of heat, which will be captured from a nearby Northern Line vent and piped into the heat network which warms local homes.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.