Queen Elizabeth II and Prince Charles, Prince Of Wales Visit The Household Cavalry Mounted Regiment at the Hyde Barracks on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II visits the Household Cavalry Mounted Regiment at the Hyde Barracks on October 24, 2017 in London, England.

Queen Elizabeth II receives flowers from young wellwishers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England. 

Queen Elizabeth II receives flowers from young wellwishers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

A young wellwisher pokes Queen Elizabeth II's handbag with his flag during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

A young wellwisher pokes Queen Elizabeth II's handbag with his flag during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II receives flowers from young wellwishers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

 Queen Elizabeth II pose with officers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

 Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II receives flowers from young wellwishers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

 Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II receives flowers from young wellwishers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II and Prince Charles, Prince of Wales pose with officers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.  

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

 Queen Elizabeth II meets family members of officers and other ranks during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.

Queen Elizabeth II meets family members of officers and other ranks during an official visit to the Household Cavalry Mounted Regiment at Hyde Park on October 24, 2017 in London, England.