By Letters Patent under the Great Seal of the Realm dated 20 February 2023, His Majesty The King has been pleased to appoint Thomas Andrew Johnston to the Office of Rouge Croix Pursuivant of Arms, vacant by the promotion in 2019 of John Michael Allen-Petrie, now Windsor Herald of Arms. The appointment has been gazetted here.

Thomas Johnston was born in Tasmania, Australia and educated at The Hutchins School and the University of Tasmania, where he read Law and Classics. He previously served as an Infantry Officer in the Australian Army (Royal Australian Regiment).