Jeremy Corbyn's Labour endured their worst election defeat since 1935 (Image: GETTY) Their manifesto pledge to hold a second referendum was torn to shreds by experts, and voters, and saw its infamous Red Wall fall to the Tories. And within weeks of 2020, Mr Johnson secured the UK's exit from the EU, signalling months of trade talks with the bloc, which would eventually lead to a pact being secured on Christmas Eve last year. More recently, Lord Adonis was under attack for making the argument to rejoin the European customs union and single market. Boris Johnson and Ursula von der Leyen before securing pact (Image: GETTY)