'The First Royal Rally', Windsor Great Park, Berkshire, 1911.
© NMeM / Royal Photographic Society / Science & Society Picture Library
Gelatin silver print. Photograph by Horace W Nicholls of the first Boy Scout rally. King George V is mounted, with Queen Mary, the Prince of Wales, Princess Mary and Princess Christian in the royal carriage. The inset shows the founder of the Scouts, Robert Baden-Powell, 1st Baron Baden-Powell (1857-1941).