King Charles has celebrated the first anniversary of his coronation with a social media video. The 75-year-old monarch – who is undergoing treatment for an undisclosed form of cancer – was crowned alongside his wife Queen Camilla, 76, at Westminster Abbey, London, on 6 May, 2023, following the death of his mum Queen Elizabeth aged 96 the previous year. A post from the royal family on its Instagram is now showing a montage of Charles’ coronation, with the footage opening with film of the king greeting well-wishers on The Mall outside Buckingham Palace on the eve of the coronation. The family ca…