Britain's Prime Minister Boris Johnson is seen outside Downing Street in London, Britain July 25, 2019. REUTERS/Hannah McKay

LONDON (Reuters) - British Prime Minister Boris Johnson promised on Thursday to make the United Kingdom the greatest place on earth by leaving the European Union on Oct. 31.

“Our mission is to deliver Brexit on the 31st of October for the purpose of uniting and re-energising our great United Kingdom and making this country the greatest place on earth,” Johnson told parliament in his first speech as prime minister.