Lights out: Britain plunged into darkness as WWI centenary marked
A 'lights out' event took place across the country last night to mark the centenary of the day Britain entered the First World War.
People were invited to switch their lights off between 10pm and 11pm - the hour war was declared on 4 August 1914.
An installation called Spectra by Japanese artist Ryoji Ikeda
Paul Gaitley (whose two grand-uncles were killed on the same day in October 1914 Able Seaman Arthur Gaitley and Private Jack Gaitley) and Alison Schulte holding candles outside Westminster Abbey
Service men walk past the grave of the Unknown Warrior, Westminster Abbey
An oil lamp burns beside of the grave of the Unknown Warrior
Members of the congregation hold candles at Westminster Abbey
Buckingham Palace is immersed in darkness
10 Downing Street
The Houses of Parliament
National Gallery, London
Piccadilly Circus
A member of the congregation lights a candle at Bath Abbey
The face of Big Ben as the clock strikes 11
More: Each one of these 888,246 poppies represents one British military fatality in WWI