How political violence and conspiracy became mainstream in Britain

10 years on from the murder of MP Jo Cox, there is a grim warning from her sister Kim Leadbeater: the atmosphere in politics now is "probably worse". Leadbeater warns of people trying to "sow division" in our country - and that's a division that Russia is seeking to exploit. One of the arsonists convicted of trying to firebomb Keir Starmer's house had also been tasked by Kremlin-linked actors with putting up far-right posters, seeking to stoke community tensions. How can it be that, after the...