London’s best known buildings and landmarks will be shrouded in darkness tonight to mark the anniversary of the start of the First World War.
Royal palaces, government buildings, museums and council offices will all take part in the Lights Out commemoration between 10pm and 11pm.
Lights will be switched off on Tower Bridge, St Paul's Cathedral, the Houses of Parliament and government departments in Whitehall. Buckingham Palace and Windsor Castle will also be dark.
The famous neon adverts in Piccadilly Circus will be replaced by a roll of honour remembering more than 2,000 residents of Westminster who died during the four-year conflict.
The organisers are encouraging Londoners to join the act of remembrance by turning off lights in their homes.