Nigel Farage slammed Keir Starmer as the “biggest threat to free speech” in British history. The Reform UK leader lashed out at the PM over his online response to unrest which has rumbled across England and Northern Ireland in the wake of the killing of three young girls in Southport. The Prime Minister has called out large social media firms for their role in allowing inciteful content to be spread on their platforms – and is weighing up imposing obligations on said firms to crack down on “legal but harmful” material. But the Clacton MP, speaking to the US’s Fox News, said: “Nobody should use…