BOURNEMOUTH, ENGLAND - SEPTEMBER 18:  Leader of the Liberal Democrats Vince Cable delivers his keynote speech during the final day of the Liberal Democrat Autumn Conference on September 19, 2017 in Bournemouth, England. Mr Cable will give his first leaders speech today, his first since assuming office in July, where he is expected to urge UK political parties to stand with the Lib Dems on their wish to remain in the European Single Market. (Photo by Matt Cardy/Getty Images)