Both the Queen and Prince Harry attended remembrance events today marking one hundred years since the start of the First World War.
The Queen and Duke of Edinburgh opened a new memorial garden in London dedicated to those killed at Flanders.
Prince Harry was at Westminster Abbey where he laid a cross in memory of the thousands killed in both world wars.
ITV News' Royal Correspondent Tim Ewart reports:
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The Queen and the Duke of Edinburgh will begin a three day official visit to Northern Ireland later today.
The Royal Couple will land at George Best Belfast City Airport before making their way to their official residence at Hillsborough Castle.
At the castle her Majesty is due to meet Stormont's First Minister Peter Robinson and Deputy First Minister Martin McGuinness.
The Queen and Duke last visited Northern Ireland in 2012 as part of her Majesty's Diamond Jubilee celebrations.
That occasion proved highly symbolic in terms of the peace process as it marked the first occasion the Queen met Mr McGuinness.
The Queen has met the Chinese Premier Li Keqiang this morning, only two months after a human rights row between China and the UK.
Mr Li and his wife traveled to Windsor Castle as part of their three-day official visit to the UK.
Mr Li is in Britain for the return leg of a trade boosting link-up begun by David Cameron last year.
He will meet the Prime Minister in Downing Street later today.
But only two months ago, the two countries found themselves in a diplomatic row over human rights.
China was angered by a British Foreign Office document criticising its rights record and called off an official meeting in London at short notice.
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The Queen today attended the finals day of the Cartier Queen's Cup to present the match trophy, won by the Zacara team for the second year in a row.
Her Majesty arrived at the event accompanied by the Duke of Edinburgh.
Prized racehorse Tea For Three still has Royal Approval after a visit from the Queen - the stallion fell early on in this year's Grand National despite being the bookies' favourite.
It was among a handful of horses inspected by the Queen during the first engagement of her two-day visit to Wales.
The monarch was the guest of honour at Wales' first-ever horse hospital, Cotts in Pembrokeshire - and was greeted by more a crowd of more than 200 people, including TV presenter Anna Ryder Richardson.
The Queen, who was dressed in a turquoise blue dress designed by Karl Ludwig and matching hat by Angela Kelly, smiled as she was given a tour of the facility by director Graham Fowke.
The Queen has visited Chequers where she and the Duke of Edinburgh had lunch as guests of Prime Minister David Cameron and his wife Samantha. It is the first time Her Majesty has visited the PM’s official country residence in Buckinghamshire since 1996.