The flags of the United Kingdom (since 1801) and the banner of arms of the old Government of Northern Ireland, as used between 1953 and 1972. (The arms were granted earlier, but a different crown was used before the reign of Elizabeth II.)
This file was derived from:

 Flag of the United Kingdom (3-5).svg: 
Flag of Northern Ireland (1953–1972).svg:
Own work based on: Flag of the United Kingdom (3-5).svg  and Flag of Northern Ireland (1953–1972).svg