JB, it's the rehearsal for the presentation of new standards. These lads will take the old standards from the Corporal Majors and then they will be carried through the Admiralty building(I carried one in 83) The navy don't like us riding through their nice clean offices!
Seriously though I was impressed with the way every sailor in the place came out of the side rooms and stood too attention along the hall ways as we passed!
Martin
p.s. three squadron standards with the union wreath and the Royal standard with Her Majesty's arms, for each regiment