Commonwealth
From Tardis Wiki, the free Doctor Who reference
The Commonwealth were the nations allied with the United Kingdom.
The Imperial Club was founded for the dispossessed nobility of Europe and the Commonwealth. (PROSE: The Clockwise Man)
Colonel Peter Rathbone claimed to represent the government of George V, Great Britain and the Commonwealth. (AUDIO: Storm Warning)
The Seventh Doctor was suspected of killing Elizabeth II, the Queen of the Commonwealth. (PROSE: Head Games)
The Eleventh Doctor told the Prince of Wales that his mother, the Queen, was busy with matters of the Commonwealth. (HOMEVID: Bad Night)
Behind the scenes
- The Commonwealth presumably refers to the Commonwealth of Nations, though this phrase has never been used in-story. It also seems to be used as a synonym for the United Kingdom itself.