Flag of the United Kingdom
The United Kingdom of Great Britain and Northern Ireland uses as its national flag the Royal Banner commonly known as the Union Jack, or more properly Union Flag as it only becomes a jack when flown at sea.
The current design of the Union Flag or Jack dates from the union of Ireland and Great Britain in 1801 with the formation of the United Kingdom. The history and nomenclature of this flag, the pre-1801 version, and its use other than as a flag for the United Kingdom (eg in Canada), and the white bordered Pilot Jack (now permitted for civilian use as a jack) are treated more fully under the article Union Jack.
The Court of the Lord Lyon, which has criminal jurisdiction in heraldic matters in Scotland, confirms that the Union Flag popularly called "The Union Jack", is the correct flag for all citizens and corporate bodies of the United Kingdom to fly to demonstrate their loyalty and their nationality.
Its correct proportions are 1:2. However, the version officially used by the British Army modifies the proportions to 3:5.
See also
