The United Kingdom flag is a white-fimbriated symmetric red cross on a blue field with a white-fimbriated counterchanged saltire of red and white. The used colors in the flag are blue, red, white. The proportion of the United Kingdom flag is 1:2. The Flag of the United Kingdom was adopted in 1801. The first use of the current flag design was in 1801. The last change to the current United Kingdom flag design was in 1801.CrossDiagonal stripesUnion Jack