Scenario: Less and Great United

As the UKs population grew throughout the 20th and 21st centuries, it became more and more difficult to manage the population and building in Great Britain. Finally in 2015 with the UK encumbered with massive and filthy urban sprawl, Parliament declared war on France with the object of annexing the sparsely populated regions of Northern France. In order to do this, the UK left the EU and then proceeded to invade Brittany and Normandy. After this British troops sieged Paris. France surrendered and ceded the provinces to Britain.