Boris Johnson faces a vote of confidence in his leadership just one day before he equals the number of days spent as prime minister by his Labour predecessor Gordon Brown.
Mr Johnson is currently on the 1,048th day of his premiership, just behind the 1,049 days clocked up by Mr Brown between June 2007 and May 2010.
He has already overtaken four prime ministers with the shortest time in office since 1900: Andrew Bonar Law (211 days in 1922-23), Alec Douglas-Home (364 days in 1963-64), Anthony Eden (644 days in 1955-57) and Henry Campbell-Bannerman (852 days in 1905-08).
