How, why, can someone wielding a sword run amok in a North East London suburb, killing a 14 year old reportedly on his way to school . Well talk to this mum, whose16 year old son was killed by teenagers who bought swords and a machete on the internet. Shes campaigning for a ban on the online sale of them. Also tonight who will win the battle for the West Midlands mayoralty . Polls suggest its soooo close between the conservatives and labour. How will the outcome affect the fortunes of the Prime Minister and labour leader over the coming months . On newsnight tonight, we have polling guru professor sirjohn curtice, claire ainslie, who was keir starmer s policy director, and Ben Riley Smith from the telegraph, who knows about the plotting going on in the tory party. Plus, rememberthis from two years ago . The brexit Opportuities Minister explaining why he had delayed bringing in post brexit checks here in the uk. This would have been an Act Of Self Harm if we had gone ahead with it. It w