As a post-Brexit trade deal is finally agreed between the UK and the EU, here's how we arrived at today's historic deal, four years after the British people voted to leave the European Union. bbc.in/3aGvabC | BBC Politics

UK PM Boris Johnson says he will ask MPs to approve an early general election, if they vote on Wednesday to block a no-deal Brexit. Latest: https://bbc.in/32iMbBo | BBC News

Before becoming prime minister, Boris Johnson was the mayor of London from 2008 until 2016. After leaving the role, he played a key part in the campaign for Brexit before being made foreign secretary and then becoming prime minister. Here's a lookback at his political career in London. Read more: https://bbc.in/3PaS3VH | BBC London