Jo Swinson, Nicola Sturgeon, Adam Price, Jeremy Corbyn and Sian Berry, stand next to ice sculptures representing the Brexit Party and Conservative Party at ITN Studios in Holborn on November 28, 2019 in London, England.

Row over Johnson debate 'empty chair'

Conservatives say Channel 4 broke impartiality rules while Labour claims the PM is "hiding from scrutiny".

bbc.co.uk