London was the capital of England and the United Kingdom. Some reports said that in January 2006, the Ori plague had infected numerous people in London. (SG1: "The Fourth Horseman, Part 2")
Alternate realities[]
- In an alternate reality that Dr. Daniel Jackson visited via the Quantum Mirror on P3R-233 in 1998, London, along with many other of Earth's major cities, had been wiped out by Apophis' forces. (SG1: "There But for the Grace of God")