The three military horses that caused havoc in London are set to have a starring role in Trooping the Colour this weekend. Five Household Cavalry Mounted Regiment (HCMR) horses were injured after being spooked by rubble being dropped through a plastic tunnel while on an exercise in Belgravia on April 24. Horses Tennyson, Trojan and Vanquish will take part in the King’s Birthday Parade after making “swift and successful” recoveries and showing “such aptitude and eagerness”, the Army said on Thursday. Two of the injured horses, Trojan and Vanquish, will be back in the public eye providing the ce…