Rishi Sunak has taken to social media to show his support for King Charles on his official birthday as the Royal Family gathered to celebrate Trooping the Colour in the heart of London. In a brief yet emphatic post, the PM simply said: “God Save The King.” The King – alongside Queen Camilla – were pictured arriving for festivities in a horse-drawn carriage at Horse Guards Parade, with Buckingham Palace confirming Charles would be ruled out from horseback while he is undergoing cancer treatment. And Princess Kate was also pictured at the event, in a landmark first public appearance since Christ…