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The Queen is to lay her traditional wreath at the Cenotaph later as Remembrance Sunday events are held across the country, one hundred years on from the start of World War One.
David Cameron said this year's events were "particularly poignant" because 2014 marked a century since the start of the war, the 70th anniversary of D-Day, and the end of UK involvement in Afghanistan.
The Queen will be joined at the Cenotaph by the Duke of Edinburgh, the Prince of Wales and Duchess of Cornwall, and the Earl and Countess of Wessex.
The Queen
The Queen attended a Remembrance festival at the Albert Hall on Saturday
Meanwhile "appropriate and proportionate" policing is in place in London amid heightened fears of a terror attack, Scotland Yard said.
Officers have also been granted seven more days to hold four men arrested in west London and High Wycombe on Thursday.
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They were detained over an alleged Islamist terror plot, but it has not been confirmed whether Remembrance Day was a potential target.
The Cenotoaph ceremony will feature a procession of current and former servicemen and women.
A shot from a World War One gun, fired by the King's Troop Royal Horse Artillery, will mark the beginning and end of the two-minute silence at 11am.
A service will also be held at the National Memorial Arboretum in Staffordshire, with wreaths laid at the stone memorial.
Later, as night falls, falling poppies will be projected onto Big Ben.
Meanwhile public calls for the Tower of London’s ceramic poppies to stay in place for longer have also been heeded.
The Wave section of the artwork, which surrounds the entrance to the Tower, will stay in place until the end of the month.
Along with the Weeping Willow section – which spills out from a window to the moat below – both will then go on a tour of the UK until 2018.
The 888,246 poppies represent a British or Commonwealth military death during the 1914-18 war and have drawn millions of visitors to the site.
The Prime Minister said the British people stood united "to remember the courageous men and women who have served our country, defended our freedoms and kept us safe.
"We remember all those who have fallen and those who have risked their lives to protect us.
"We owe each and every member of our armed forces and the families who support them a tremendous debt - one that can never be repaid - and I pay huge tribute to their bravery and resolve."
Mr Cameron has also announced plans for a £1m national memorial to the servicemen and women who have served in Iraq and Afghanistan.
http://news.sky.com/story/1369757/queen ... t-security
