Thames Water customers could see their bills come down in the future thanks to an environmentally friendly piece of engineering.
The utilities company has revealed plans to spend £250 million accelerating what it describes as a "vast 'poo power' programme" designed to ensure it generates a fifth of its electricity from waste that flows from the sewage works.
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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.