The Queen will lead a remembrance service in the capital today as she lays the first wreath on the Cenotaph at Whitehall.
The event is the focal point of the country's Remembrance Sunday ceremonies and will see other senior royals, Prime Minister David Cameron and London Mayor Boris Johnson also leaving floral tributes at the memorial.
After the wreath laying ceremony and two minute silence at 11am, more than 10,000 military veterans and civilians will march past the Cenotaph.
More top news
Scotland Yard confirm that two people arrested in connection with the attack on Westminster have been released with no further action
An appeal to support the family of murdered policeman Keith Palmer has reached more than £700,000 in two days.
PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.