Theresa May has suffered a landslide and historic defeat yet has pledged to face down a vote of no confidence in her government, after her Brexit deal was shot down by MPs in the heaviest parliamentary defeat of the democratic era. On a day of extraordinary drama at Westminster, the House of Commons delivered a devastating verdict on the prime minister’s deal, voting against it by 432 to 202. The scale of defeat, by a majority of 230, was greater than…