In local elections Johnson stood unsuccessfully as the Conservative candidate in the Danson ward of the London Borough of Bexley in 1994, before being elected in the Christchurch ward in 1998. He served one term of four years and did not stand for re-election in 2002. He served as Constituency chairman for the Conservative Party in Bexley. In the 2001 general election Johnson unsuccessfully stood in the Labour-held seat of Lewisham West in London; the Conservative Party suffered a swing of 1.5% against it. He was unsuccessful again when he stood in Dartford at the 2005 general election, but this time achieved a swing in his favour of 0.5%. However, standing again in Dartford at the 2010 general election, Johnson was elected as Member of Parliament, winning the seat from Labour with a 10,628 majority. Johnson said during an interview at a local school that he believed firmly that students should have to pay £9,000 a year, and is quoted as saying "why should a plumber pay for a doctor to go to university." In the 2014 reshuffle he became PPS to David Gauke, newly promoted Financial Secretary to the Treasury. In the 2015 general election, Johnson retained his seat and increased his majority to 12,345. Following the election, he was made PPS to Matthew Hancock, Paymaster General of the Cabinet Office. Johnson is listed as being the chair of the All Party Parliamentary Group on the Dominican Republic in December 2015. He previously served as the vice-chairman of both the Retail APPG and the British Sikhs APPG. Johnson has also previously been a member of both the Child and Youth Crime APPG and the BBC APPG. In January 2016, Johnson led a Westminster Hall debate on congestion at the Dartford Crossing. Johnson has previously served on the Justice Select Committee, the Human Rights and the Science and Technology Select Committee. Since the 27 June 2017, he has served as Parliamentary Private Secretary to the Secretary of State for Exiting the European Union. He was re-elected at the 2017 general election, with an increased majority of 13,186. He was appointed Assistant Government Whip in November 2018, resigning on 14 January 2019 in disagreement with Prime Minister Theresa May's policy for Britain leaving the European Union.
Personal life
Johnson lives in the village of Hartley with his wife Wendy and their two children. Johnson employs his wife as a part-time Parliamentary Assistant on a salary up to £25,000. He was listed in an article in the Daily Telegraph criticising the practice of MPs employing family members, on the lines that it promotes nepotism. Although MPs who were first elected in 2017 have been banned from employing family members, the restriction is not retrospective - meaning that Johnson's employment of his wife is lawful.