BBC News
By Sam Francis
image caption(Left to right:) The Liberal Democrats' Luisa Porritt, Labour's Sadiq Khan, Sean Bailey of the Conservatives and Green Party candidate Sian Berry answered a range of questions
Candidates for the four largest parties running to be mayor of London clashed in Sunday's debate.
Prompted by questions from an audience of six specially-selected undecided voters, the candidates set out their stall on policing, transport and the capital's recovery from the pandemic.
So what did the audience make of their performance?
'We're going to hold them to account'
Christian Douglas, a youth worker from south London, asked all the four politicians how they would tackle knife crime.