What is Flag of the United Kingdom?
{{Infobox flag| Name=United Kingdom of Great Britain and Northern Ireland |Image2=Civil Ensign of the United Kingdom.svg |Design2=A red flag with the Union Flag in the corner at the top of the flag pole. See [[Red Ensign]]. |Proportion2=1:2 |Use2=000100 |Symbol2={{FIAV|000100}} |Image3=Civil Air Ensign of the United Kingdom.svg |Design3=A blue flag with the Union Flag in the corner at the top of the flag pole and a black cross in the centre. See [[British Civil Air Ensign|Civil Air Ensign]]. |Proportion3=1:2 |Use3=[[Civil air ensign]] |Image4=Government Ensign of the United Kingdom.svg |Design4=A blue flag with the Union Flag in the corner at the top of the flag pole. See [[Blue Ensign]]. |Proportion4=1:2 |Use4=000010 |Symbol4={{FIAV|000010}} |Image5=Naval Ensign of the United Kingdom.svg |Design5=A white flag with the Union Flag in the corner at the top of the flag pole and a red cross in the centre. See [[White Ensign]]. |Proportion5=1:2 |Use5=000001 |Symbol5={{FIAV|000001}} |Name5=Saint George's Ensign |Image6=Ensign of the Royal Air Force.svg |Design6=A blue flag with the Union Flag in the corner at the top of the flag pole and the [[Royal Air Force roundels|RAF roundel]] on the opposite side. |Proportion6=1:2 |Name6=[[Royal Air Force Ensign]] |Use6=[[Air force ensign]] |Article=the |Design=A combination of the crosses of SS Andrew, George, and Patrick |Adoption={{ubl|{{Start date and age|1801|1|1|df=y}} |{{Small|first design: {{Start date and age|1606|4|12|df=y}}}}}} |Proportion=1:2 (commonly) and 3:5 |Symbol={{FIAV|normal}}{{FIAV|111000}}|Use=111000 |Image=Flag of the United Kingdom (1-2).svg |Nickname=Union Jack, Union Flag |Morenicks=<br/>{{small|other names: {{nowrap|The Britain}}; {{nowrap|The British Flag}}; {{nowrap|the Union}}; {{nowrap|The Banner of the Union}}; {{nowrap|the Great Union}}; {{nowrap|the Flag of the Union}}; {{nowrap|the Jack}}; {{nowrap|The King's Jack}}; {{nowrap|His Majesty’s Jack}}; {{nowrap|Our Jack}}; {{nowrap|the Jack Flag}}}}}}The '''flag of the United Kingdom''' is the '