Millions of people are expected to join the various ceremonies that commemorate Armistice Day, which remembers the sacrifice of the war dead, later Friday.
A two-minute silence will be observed in honour of Britain's fallen heroes at 11 GMT, when guns fell silent on the Western Front for the final time at the end of World War I, 93 years ago.
Various other ceremonies, including one at the Cenotaph in Whitehall, London, will also commemorate the sacrifice of the British soldiers killed in Afghanistan since 2001.
At Trafalgar Square, the Royal British Legion will conduct a Silence in the Square event.
Events are also to be held at Glasgow, Belfast, Cardiff, Plymouth and Newcastle.