Flags of Great Britain: the flag of Wales (since 1959) together with the flags of England and of Scotland (since the Middle Ages) and the flag of Northern Ireland (1953–1972).
N.B.: Strictu sensu, this combination of flags was official between 1959 and 1972, but the banner of arms of the old Government of Northern Ireland (the "Ulster banner") continues to be used in some contexts; no official alternative exists.
This file was derived from:

 Flag of Wales.svg
Flag of England.svg
Flag of Scotland.svg
Flag of Northern Ireland (1953–1972).svg
Own work based on: Flag of Wales.svg: , Flag of England.svg: , Flag of Scotland.svg:   and Flag of Northern Ireland (1953–1972).svg: