A boost for Labour as another Tory MP defects. But with growing disquiet amongst the Labour ranks - could the coup backfire?

Also on the programme:

University leaders will meet at Downing Street tomorrow to discuss what the prime minister calls an “unacceptable rise in antisemitism” on campuses. We'll speak to a Jewish student leader - and a pro-Palestinian protester who's gone on hunger strike.

As Russia's military attache is expelled for spying - what goes on behind the gates of the Russian Embassy in London?

And the sperm whale whisperer: we speak to the scientist who's been decoding the sounds from the deep that resemble a human language.