On June 25, 2024, King Charles III and Queen Camilla hosted Emperor Naruhito and Empress Masako of Japan at Horse Guards Parade, London, marking the start of a three-day state visit. The ceremonial welcome included a military parade and a carriage procession to Buckingham Palace, where a private lunch and a state banquet were scheduled.
Prince William escorted the guests, while Princess Anne was absent due to recovering from head injuries and a concussion sustained at her Gatcombe Park estate. Despite the visit coinciding with the UK's general election campaign, key engagements took place, reflecting strong cultural and diplomatic ties between the two nations.