The Labour Party is the main centre-left political party in the United Kingdom. It is a social democratic party. It has been one of the UK's two main political parties from the early 20th century to the present day. It is currently the second largest party in the British House of Commons, with 262 out of 650 seats. It forms the Official Opposition. Its last leader was Jeremy Corbyn. The current Labour Party leader is Sir Keir Starmer. He was elected on 4 April 2020.