King Charles is set to break tradition at Trooping the Colour this year amid the monarch’s cancer treatment, it has been claimed. The King, 75, is expected to travel by carriage during next month’s Trooping the Colour rather than on horseback. The monarch is determined to take part in his official birthday celebrations on June 15 but concessions will be made as he continues his cancer treatment, The Telegraph has reported. For several weeks, Buckingham Palace and the Ministry of Defence have been exploring ways in which he can take part while avoiding any undue risk to his health. The options …