On Parade - Her Majesty The Queen's Birthday Parade 2021 - The Household Division - Official site - lists the entire parade personnel
A Celebration of the Official Birthday of Her Majesty The Queen - Trooping the Scots Guards Colour | The British Army (mod.uk)Lieutenant Colonel David Marsham, 44, from King’s Lynn, has 20 years of operational service in Northern Ireland, Iraq and Afghanistan, and in the past year was commanding troops employed in the COVID testing programme in the NW of England. He is this year’s
Field Officer in Brigade Waiting – the officer commanding the Queen’s Birthday Parade. By remarkable coincidence, in 1920, as Britain was coming out of the last pandemic, Viscount Marsham, David’s direct ancestor, was Captain of the Escort on the King’s Birthday Parade.