Overview: Tonight, we take another look at the situation in Libya. While Libyan rebels remain locked in battle with pro-Gaddafi forces, the UK steps up the pressure on Col Gaddafi by insisting all Libyan diplomats leave the UK. Former Labour cabinet minister James Purnell tells Newsnight that one of the reasons the Labour Party lost the last election was that their supporters no longer backed the welfare state. He's live in the studio later to discuss how the welfare system could be transformed. And could we be seeing the end of scientific testing on monkeys? [Spoiler Alert: No] We'll be discussing the issues.