Great Britain

The United Kingdom, officially the United Kingdom of Great Britain and Northern Ireland (commonly truncated as Britain), was a country located in Europe before the Great War.

Background
On October 14, 1066, the Battle of Hastings was fought in England as part of the Norman conquest, led by William the Conqueror. In 1215, the Magna Carta was signed by King John of England and English barons, greatly limiting his authority as king and placing more power into the hands of the feudal government. On March 25, 1634 Lord Baltimore of the Irish House of Lords dispatched the first colonists to Maryland. They would land near the area that would later become Point Lookout aboard two ships, the Ark and the Dove.

On April 19, 1775, the Battles of Lexington and Concord occurred, starting the American Revolutionary War, fought between the Kingdom of Great Britain and the newly formed United States, made up of thirteen of its North American colonies. On July 4, 1776, the United States Declaration of Independence was adopted by the Second Continental Congress, explaining to the British why they were at war with them and announcing the United States' intent to independently govern itself. The war would continue until 1783 with the Treaty of Paris, which confirmed American independence.

The United Kingdom was formed in 1801 with the Act of Union between the Kingdom of Great Britain and the Kingdom of Ireland; the Kingdom of Great Britain itself being formed in 1707 with a similar act of Union between the Kingdom of England and the Kingdom of Scotland (Wales at the time being considered part of England). The United Kingdom of Great Britain and Northern Ireland, the latest incarnation of a British state, was formed after the Irish War of Independence, resulting in a part of Ireland referred to as Northern Ireland remaining with the United Kingdom, and the other becoming an independent Irish state known as the Republic of Ireland.

The United Kingdom also fought on the side of the Allies during World War II, as one of the four leading countries of the alliance. The United Kingdom controlled many overseas territories, and at its peak led the largest empire in human history. As of 1945, such areas included Canada, India, much of Africa, and what would become the nation of Israel. Dialogue suggests that the country was ruled by a queen before the outbreak of the Great War.

Mentions
There are several references to the United Kingdom in published Fallout games:

England
In the Sacred head of the Vault Dweller special encounter, it will mention Stonehenge, an ancient ring of standing stones in England.
 * Fallout
 * Loxley speaks with an English accent and knows of English folktales such as Robin Hood, but he learned this from holotapes and is not actually English himself.
 * Patrick the Celt claims to be a decedent of the Celtic people, a prehistoric group who lived in parts of Europe, with a large presence on the British Isles.
 * Fallout 2
 * Fallout 3
 * Allistair Tenpenny traveled to the Capital Wasteland from England to seek his fortune.
 * A copy of the Magna Carta, an important document that was written in England in the year 1215, can be found in the National Archives.
 * Music by Sid Phillips is played on Galaxy News Radio.
 * Point Lookout
 * Desmond Lockheart was a high-ranking agent working for the British government.
 * Captain John Smith was an English explorer who was the first European to discover Point Lookout in 1612. In addition, two English ships, the Ark and Dove, landed near Point Lookout in 1634, and began the process of the founding of the state of Maryland.
 * Fallout: New Vegas
 * Music by Bert Weedon is played on Mojave Music Radio and Radio New Vegas.
 * The song Jazz Club Blues by Harry Bluestone is played.
 * Old World Blues
 * The Sink Central Intelligence Unit and Sink both speak in received pronunciation.
 * The Courier's brain recites a line from a musical number from H.M.S. Pinafore, a British comic opera made in Victorian-era Britain by Gilbert and Sullivan.
 * Fallout 4
 * Whitechapel Charlie, who has a cockney accent, is named after the London district which was notorious for being a den of debauchery in the 19th century, and in particular for the infamous Jack the Ripper murders. He also has a small Union Flag on his chassis.
 * Both Proctor Quinlan and Colter speak with English accents.
 * Far Harbor
 * A fisherman in Far Harbor, Kye, claims his family hails from Yorkshire, a group of four counties in northern England. He also speaks with a Yorkshireman accent.
 * Nuka-World
 * A plaque at Wixon's shovel museum mentions British soldiers (albeit in a fictionalized manner) during the American Revolutionary War.
 * Fallout 76
 * A holotape recorded by a coffin salesman from the English town of Ipswich can be found in the workout room of the Green Country Lodge.
 * Wild Appalachia
 * The Rosetta Stone, which has been on display in the British Museum in London since 1802, is mentioned in the Pioneer Scouts archaeology exam.
 * The United Kingdom is listed as the correct answer to the question, "Which country was the first to build a major railway system?" in an exam at the Pioneer Scout camp.
 * Queen Victoria, Geoffrey Chaucer, and Isaac Newton, three English historical figures, are also mentioned.
 * Wastelanders
 * When impersonating a slaver to get into the Watoga Civic Center, Johnny Weston pretends to be one Reginald P. Humphries, an Englishman who was unable to get home after the Great War. He also mentions his origins may be from the country.
 * Fallout Tactics
 * Sharon's family is claimed to stretch back to the English county of Essex.
 * One of Martin's ancestors once ran a software company in England that ended up going out of business.
 * Fallout Shelter
 * The cat breed British Shorthair and dog breed English Mastiff are available as pets.

Scotland

 * In Fallout, MacRae, a Scotsman, appears as an Unarmed combat trainer for the Blades.
 * Scotch is a type of whisky that originates from Scotland.
 * Music by Billy Munn is played on Galaxy News Radio in Fallout 3.
 * In Fallout: New Vegas, the Loch Ness Monster, the famous Scottish mythical creature, is referenced in two emails from Jenny DeSoto in the H&H Tools Factory.
 * In Fallout Shelter, the cat breed Scottish Fold is available as a pet.

Wales

 * In Fallout 4, the Brotherhood of Steel sail aboard The Prydwen, an armored airship that arrives in the Commonwealth from the Capital Wasteland. Prydwen was the name of King Arthur's ship used to sail to Ireland in Preiddeu Annwfn, a famous Welch poem.

Ireland
In the Commonwealth, there is an abundance of Irish national flags and symbolism.

Known locations

 * Loch Ness (mentioned in Fallout: New Vegas)
 * London (mentioned in Fallout 4)
 * Yorkshire (mentioned in Far Harbor)
 * Ipswich (mentioned in Fallout 76)
 * Essex (mentioned in Fallout Tactics)
 * Royal Small Arms Factory (mentioned in Fallout 2 and ''Fallout Tactics)
 * Stonehenge (mentioned in Fallout 2)

Appearances
The United Kingdom or nations within it are mentioned or referenced in Fallout, Fallout 2, Fallout Tactics, Fallout 3 and its add-on Point Lookout, Fallout: New Vegas and its add-ons Dead Money, Honest Hearts, and Old World Blues, as well as Fallout 4, Fallout 76 and its updates Wild Appalachia and Wastelanders.