This event took place in London in 2015, at which time Boris was still Mayor of London.
What a delight to listen to the banter between these two, as well as to questions from the audience with Boris and Mary's reactions and asides.
Click here to watch the show.
You can click the small arrows at the right hand bottom of the screen to make the video full-screen.
Enjoy ❤️ ❤️ ❤️