Lights Out At The Abbey
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 Duke and Duchess of Cambridge, Prince Harry and David Cameron attended a twilight ceremony at St Symphorien Military Cemetery near Mons, Belgium.
The Prince of Wales was at a service in Glasgow, among other commemorations.
The Lights Out event - organised by 14-18 NOW, a cultural programme to mark the centenary - saw households, businesses and public buildings across the UK turn out their lights to leave a single candle or light burning.
The event was inspired by the words of wartime Foreign Secretary Sir Edward Grey, who said on the eve of WW1: "The lamps are going out all over Europe; we shall not see them lit again in our lifetime."
The conflict between 1914 and 1918 - which became known as the Great War - left 17 million soldiers and civilians dead.
- Kevin Paton-Feaver