The shield is quartered representing the four constituent states of the United Kingdom: Scotland, Wales, Northern Ireland and England. The barracks in the upper left corner and the one in the lower right corner represent England; the second represents Scotland and the third, with the yellow harp on a blue background, Northern Ireland. You have all the information in: «Curiosities about the coat of arms and flag of the United Kingdom«.

You have all the information in: "Curiosities about the coat of arms and flag of the United Kingdom".