The London Olympics have been named the most sustainable Games ever by an independent watchdog. The Commission for a Sustainable London 2012 praised the Games' recycling and transport policies - and said they could provide a model for future sports events.
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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.