Tributes to the fallen a century since World War I was declared Across UK Monday Aug 04,2014

A candle-lit vigil at Westminster Abbey and a "lights out" event have concluded a day of ceremonies marking 100 years since Britain entered World War One.

People were invited to turn off their lights for an hour until 23:00 BST, the time war was declared in 1914.

The London Eye, 10 Downing Street and the Houses of Parliament were among Britain's landmarks which turned out their lights for an hour at 10pm last night to remember those who died in the First World War.

Homes, businesses and public buildings across the UK were asked to leave on a single light or candle to commemorate the moment then-prime minister Herbert Asquith declared Britain had entered the First World 
War at 11pm on August 4, 1914.
 

Buildings around the country yesterday took part in the 'hour of reflection' between 10pm and 11pm, leaving just a light illuminating a window.

The clock face of Big Ben was the only light illuminating Westminster at 11pm last night, which marked the moment the First World War began 100 years ago

The Shard in central London is seen with the spire lights switched off

The Cenotaph in central London during an hour's darkness to mark 100 years since the beginning of First World War

A single light was shining from Buckingham Palace like many other buildings across the country as 100 years since Britain entered World War One was remembered

Piccadilly Circus in London displays memorial images as the lights are turned off on buildings and the UK marks the centenary of the outbreak of the First World war

An oil lamp burns next to the tomb of the Unknown Warrior in Westminster Abbey, which is decorated with flowers

Prince Charles, David Cameron, Nick Clegg and Ed Miliband were taking part in a series of events being held 100 years to the day after the start of the First World War

Prince Charles walks out of Glasgow Cathedral with the Lord Provost of Glasgow Sadie Docherty after attending a memorial service to mark the centenary of the outbreak of the First World War

The Queen, who is currently on holiday in Scotland, attended a local service close to Balmoral at Crathie Kirk in Aberdeenshire

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge speak with French President Francois Hollande (R) as they attend on August 4, 2014 at Le Memorial Interallie in Liege, Belgium, commemorations marking 100 years since the invasion of Belgium by Germany at the start of World War I.