James O'Brien is Leading Britain's Conversation.
13 August 2015, 21:04
The Labour Mayoral hopeful got very passionate as he defended the "institution" that is London's black cabs - and rounded on Uber.
Diane Abbott, Tessa Jowell and Sadiq Khan all agreed that more restrictions were needed on private hire services in London.
It was David Lammy though who got most worked up about the issue - lashing Uber for "not paying any tax", "real issues around safety" and "horrible issues around homophobia".
Promising that if he was chosen to replace Boris Johnson he would challenge Uber, Lammy said it was vital to protect "the institution that is the black cab".
Watch his call to arms for London's taxis above.