London mayor election: Portillo not voting for Johnson
20 April 2012 Last updated at 11:33 BST
A former Conservative Defence Secretary has failed to give any backing to the Tory candidate in the London mayoral election.
Michael Portillo said he wanted a mayor who supported a third runway at Heathrow Airport.
He did not name who would get his vote, although only the independent Siobhan Benita is backing such a policy.
Mr Portillo has previously been teased on This Week about his lack of support for Boris Johnson.