epa11436145 Members of Britain's armed forces take part in a ceremonial welcome for the Emperor and Empress of Japan at Horseguards Parade in London, Britain, 25 June 2024. Emperor Naruhito and Empress Masako of Japan are undertaking a three day state visit to the UK. EPA/NEIL HALL

epa11436140 Britain's Queen Camilla (C) arrives for the ceremonial welcome for the Emperor and Empress of Japan at Horseguards Parade in London, Britain, 25 June 2024. Emperor Naruhito and Empress Masako of Japan are undertaking a three day state visit to the UK. EPA/NEIL HALL

epa11436142 Emperor Naruhito of Japan (3L) and Britain's King Charles III (2L) take part in a ceremonial welcome for the Emperor and Empress of Japan at Horseguards Parade in London, Britain, 25 June 2024. Emperor Naruhito and Empress Masako of Japan are undertaking a three day state visit to the UK. EPA/NEIL HALL