Great Britain

Great Britain was the largest of the British Isles. Politically, it was made up of England, Scotland and Wales. Its capital cities included London, Edinburgh and Cardiff. Along with at least parts of the island of Ireland, it comprised the United Kingdom. People from Great Britain were variously self-identified as "English", "Scottish" or "Welsh" — although members of any of these groups were also more generally referred to as "British". The Doctor's long association with the island led him to often be identified as British, typically when he was visiting other parts of Earth. (DW: The Gunfighters, Doctor Who (1996)).

Aliens seemed particularly interested in Great Britain. It perhaps attracted more extra-terrestrials than any other single land mass on Earth.

History
By the 21st century Britain was identified as one of the most obese areas of the galaxy (DW: Partners in Crime)

In the 29th century, due to solar flares, the United Kingdom abandoned Earth for a starship; this continued at least until the 33rd century. (DW: The Beast Below)

By the 50th century during the later Ice Ages Brittanicus Base was located here. (DW: The Ice Warriors)