Are you familiar with North and South America? Britannia occupies both continents, along with Russia, North-East and Southern Africa, and Western Europe up to the borders of Germany and Italy, the former of which is part of the EU and the latter of which belongs to the Chinese Federation. The British Isles are also members of the EU. Or rather, that's how things were. It's impossible to say what they will become now.

[Frowns a little at the question. Who indeed?]

There was no victor.