Armistice Day is commemorated every year on 11 November to mark the armistice signed between the Allies of World War I and Germany at Compiègne, France, for the cessation of hostilities on the Western Front of World War I, which took effect at eleven o'clock in the morning—the "eleventh hour of the eleventh day of the eleventh month" of 1918. (nicked straight from Wikipedia)
On the nearest Sunday to November 11th, Remembrance Sunday, wreaths are laid at the Cenotaph by the Queen (or senior Royal) and at war memorials all over the UK
The poppy is a familiar symbol on our streets at this time of year. Initially used to help soldiers returning from the first world war, a century on the money raised from the Poppy Appeal is used to help the armed forces, veterans, and their families.
The poppy was inspired by World War I poem "In Flanders Fields" by Canadian physician Lieutenant Colonel John McCrae.
This year is a hundred years since the end of the First World War and 888,246 ceramic poppies have been placed in the moat around the Tower of London, with each one representing a British or Commonwealth fatality between 1914 and 1918. All net proceeds plus 10% of every £25 poppy sold will be shared between six service charities, including Help for Heroes and the Royal British Legion.
The sea of red is created by the poppies.