David Cameron has announced that key parts of the poppy display will now stay in place for longer following a huge public campaign.
The installation, entitled Blood Swept Lands and Seas of Red, has seen the moat fill up with 888,246 ceramic poppies representing British soldiers who lost their lives in the First World War.
Much of the capital will fall silent later this morning as Londoners come together to mark Armistice Day. The focus for many will be the field of ceramic poppies at the Tower of London, where the final poppy will be planted just before 11 o'clock.
Elsewhere a service of Remembrance will be held at the Cenotaph in Whitehall, while crowds are expected to flock to Trafalgar Square for a special event to honour the fallen soldiers of the First and Second World Wars. Hosted by the Royal British Legion, 'Silence in the Square' will feature musical performances and readings.
The two main structures will go on tour around the country from 2015 to 2018 before going on permanent display in London.
Visitors hoping to see the Tower of London poppies are being urged to stay up late or get up before dawn.
The art installation made up of 888,246 poppies in the moat is due to be dismantled on November 12th.