The lights go out all over London

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From the Houses of Parliament to Canary Wharf, London was plunged into darkness in one coordinated, hour-long switch-off to highlight the potential for massively reducing carbon emissions from electricity generation.

Even Piccadilly Circus's neon adverts were switched off for the first time since the Second World War. The Lights Out London campaign encouraged all businesses and homeowners to turn off all lights and non-essential appliances between 9pm and 10pm last night.

Standard photographers captured the moments when famous landmarks went dark. Others taking part included Buckingham Palace, the BT Tower, City Hall and Harrods. The Mayor's office said the switch-off would have saved about 750 megawatt-hours of electricity - enough to run 3,000 televisions for a year.

Capital 95.8, which sponsored the event, broadcast live acoustic performances from Mutya Buena and Ross Copperman.

According to the switch-off 's organisers, UK households use £1.2billion of electricity a year on lighting, and keeping an average office lit overnight wastes enough energy to make 1,000 cups of tea.

Friends of the Earth welcomed the switch-off. A spokesman said: "The majority of the capital's carbon dioxide emissions come from buildings, so switching off lights and appliances that aren't needed can play a significant role in tackling climate change."