Theresa Mary May t r i z n e Brasier, is a British politician serving as Prime Minister of the United Kingdom since . She was Home Secretary from and Leader of the Conservative Party from ..The latest Tweets from Theresa May @theresa_may . Prime Minister and @Conservatives Leader. Theresa May Theresa May, Conservative Party leader and the second woman prime minister in U.K. history. While overseeing Brexit, the British exit from the EU, she called an early election in June in which her party lost seats, forcing her to secure support from the Democratic Unionist Party to continue to govern..Theresa May was driven away from No today looking relieved and almost immediately afterwards, Nigel Farage turned up to deliver a copy of his blueprint for a ‘clean break’ from the EU..