Plot: Tonight on Newsnight Richard Watson examines if Britain was turning a blind eye to maltreatment and colluding with the Gaddafi regime to arrange the rendition of Libyan terror suspects - the PM has said that allegations that MI6 was involved should be examined by an independent inquiry. Paul Mason will be asking if the IMF's managing-director, Christine Lagarde, was right when she said the global economic outlook had darkened suddenly over the summer, and Jeremy will be speaking to the former chancellor Alistair Darling