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Boris Johnson 'steps down as MP' Boris Johnson 'steps down as MP'
(10 minutes later)
London Mayor Boris Johnson is about to announce he is to step down as Conservative MP for Henley. London Mayor Boris Johnson has announced he is to step down as Conservative MP for Henley.
The move, one of Mr Johnson's pre-election pledges, will spark a by-election in the Oxfordshire seat - one of the safest in the country.The move, one of Mr Johnson's pre-election pledges, will spark a by-election in the Oxfordshire seat - one of the safest in the country.
Oxfordshire councillor John Howell will be the Conservative candidate.Oxfordshire councillor John Howell will be the Conservative candidate.
Labour's candidate is Richard McKenzie, and the Lib Dems' is Stephen Kearney. The Greens have chosen Mark Stevenson and UKIP have selected Chris Adams.Labour's candidate is Richard McKenzie, and the Lib Dems' is Stephen Kearney. The Greens have chosen Mark Stevenson and UKIP have selected Chris Adams.
Mr Johnson announced his retirement from the House of Commons at his first news conference as London mayor.
The most likely date for the by-election is 26 June.
Boris Johnson succeeded former Deputy Prime Minister Michael Heseltine as MP for Henley at the 2001 general election with a majority of 8,458.
He was re-elected in 2005 with an improved majority of 12,793 and a 53% share of the vote.