1 of 12 Relatives and friends planted tiny wooden crosses at the Field of Remembrance at Westminster Abbey.
2 of 12 The Queen and the Duke of Edinburgh each laid a cross to open the Field of Remembrance at Westminster Abbey.
3 of 12 An estimated 45 million British people observed a two-minute silence at 1100 GMT.
4 of 12 Visitors to the Black Watch memorial at Aberfeldy, near Perth, observed a two-minute silence at 1100 GMT.
5 of 12 Staff and passengers at York railway station observed a two-minute silence at 1100 GMT.
6 of 12 Elizabeth Phillips, nine, from St John's School, stood silent during a ceremony at which children from four primary schools laid crosses of remembrance at the foot of each grave in the Fields of Honour Cemetery, Ipswich.
7 of 12 A Britannia School pupil held a cross of remembrance during a ceremony at the Fields of Honour Cemetery, Ipswich.
8 of 12 Raqual Harper-Titchener, Angel and Matheson, the wife, son and daughter of Royal Military Police officer Maj Matthew Titchener, killed in Iraq, attended a ceremony to unveil his name on the war memorial in his home town of Southport, Merseyside.
9 of 12 Artillery Regiment veteran Arthur Wragg, 83, walked from York's Remembrance Day ceremony.
10 of 12 A startled fox ran in circles around the Field of Remembrance at Westminster Abbey.
11 of 12 The Thames river will be lit up in red every night until Sunday when the Queen, accompanied by about 9,000 veterans, will lay a wreath at the Cenotaph.
12 of 12 British Army Col Tim Allen, commanding officer, National Liaison Headquarters (right), and Col Ronald J Johnson, commanding officer of the 24th Marine Expeditionary Unit, laid a wreath in Iraq.