Jenny Jones, Brian Paddick and Ken Livingstone have all promised fares cuts in their manifestos with Livingstone promising to resign if he does not deliver a 7% cut this year.
Jones told the studio audience that “It’s only the Conservatives saying they have got to put [fares] up.”
Since coming to office in 2008 Mr Johnson has implemented a succession of fare increases and has committed to further increases of RPI + 2%.
Mr Johnson’s campaign has previously dismissed Labour’s policy as “dishonest”, insisting that a cut would “bankrupt” Transport for London and threaten investment in upgrades.
However appearing on BBC One’s London Mayor debate last night, Johnson said he would “look at what we can do next year to bear down on fares”.
Recent polls suggest that while Livingstone’s promised cut is popular, voters are evenly split on whether he would deliver it.
Candidates for Mayor include Jenny Jones (Green party), Ken Livingstone (Labour), Lawrence Webb (UKIP) Boris Johnson (Conservative) and Brian Paddick (Liberal Democrat). A full list of candidates can be found here.