London is in Europe but Berlin in Germany? seems pretty ironic given recent news
London is in Europe as much as it has ever been. Geographically, its status hasn't changed -- whether you consider the island off the coast of the European mainland part of Europe or not; politically, its still the capital of the UK, which -- despite having voted that its government should withdraw from the EU -- remains an EU member, and not even formally on the exit path yet.
Europe is a continent, the EU an organization.