Brexit
From Tardis Wiki, the free Doctor Who reference
Brexit was something which the youth of 2016 considered to be unstoppable. (PROSE: What She Does Next Will Astound You)
Behind the scenes
Brexit is the United Kingdom's exit from the European Union.
In the DWU, the UK is still explicitly part of the European Union in AUDIO: The Longest Night, when the British Prime Minister signs the Euro-Combine treaty. Even in this storyline, though, many see the strengthening of the "European superpower" as a threat to the UK's independence.
The UK later belongs to the Eurozone in AUDIO: Hothouse and PROSE: Trading Futures.