On January 15, 2019, Prime Minister Theresa May’s Brexit deal suffered a defeat of historic proportion in the House of Commons: 432 MPs voted against and 202 for the ‘EU Withdrawal Act’, with a staggering margin of 230 votes. But how do the MP positions on May’s deal compare with the constituency-level votes on the 2016 referendum? [i] Notably, almost all the intra-party variation in voting takes place on the Tories’ side of the aisle. Only 3 Labour MPs bucked the party line and voted for the deal, whereas 118 Tories voted against May’s proposal. The plot below shows the …

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