London is the capital city of the United Kingdom. It is the largest metropolitan area of the country, and it possesses the largest city GDP of Europe. It appears midway through the story arc of Ace Combat: Joint Assault.
Halfway through the story of Joint Assault, the terrorist organization Valahia began announcing that London would be their next target for a terrorist attack. Sometime after the Valahia's attack on Tokyo, Japan's capital, Valahia commenced a full-scale night raid on London, spearheaded by their heavy command cruiser Spiridus. International Union Peacekeeping Forces engaged in battle with the Valahian forces, backed up by affiliate Martinez Security's elite Antares Squadron, and a fierce battle ensued. This battle would mark a turning point in the war, however, as the Spiridus would suffer crippling damage thanks to Antares Squadron, which forced it to activate its anti-air electrolaser cannon. Even then, the aircraft could not hold its own in battle, and by the end of the battle it was completely crippled. As the aircraft went critical, it attempted to fire its onboard railgun at the British House of Parliament. However, as the Spiridus' railgun was about to fire, its rear heat vent was destroyed and the Spiridus crashed into the River Thames and exploded.
The attack on London, however, was orchestrated by Andre Olivieri, the CEO of Olivieri Life Insurance: similar to what happened in Tokyo, Andre expected that the stock prices of London would skyrocket as people contracted insurance services in case Valahia ever attacked the city. Needless to say, the plan was an absolute failure.