Prince William and Kate unveil poppy tribute to fallen World War I heroes

Looking sombre, Prince William and the Duchess of Cambridge, née Kate Middleton, continued their commemmoration of World War I by unveiling an art installation at the Tower of London.

Joined by Prince Harry, the royals walked, heads bowed slightly, among a sea of ceramic poppies pouring out of the Tower into the moat below and symbolising the hundreds of thousands of lives lost in the conflict.

Prince William, Kate and Prince Harry each planted a ceramic poppy at the installation

Kate, who had recycled a deep blue LK Bennett dress for the occasion, was seen chatting with the Beefeater guards who are on duty at the Tower.

Entitled Blood Swept Lands And Seas of Red, the exhibition will eventually be made up of 888,246 flowers representing the British and Commonwealth service personnel who died during the war.

Each one was handmade in Derby by volunteers with a family link to the heroes who paid the ultimate sacrifice. This way no two are the same.

More flowers will be planted throughout the summer before the last one on Armistice Day on November 11, marking the official end of the conflict.

On Monday, the royal trio were in Belgium, where they took part in a moving twilight ceremony, lit only by lanterns to remember the dead.

More than 50 heads of state, including hosts King Philippe and Queen Mathilde looked on as the Duke of Cambridge made a speech, praising the European country for its continued remembrance of World War I.

He went on to quote British nurse Edith Cavell, pointing that she “saved soldiers from each side. On the night before she faced a German firing squad, she said: “I must have no hatred or bitterness towards anyone””.