Wheels Within Wheels, Parties Within Parties

On BBC News 24's Head 2 Head, David Aaronovitch described how he had recently chaired a Labour Deputy Leadership hustings in Sheffield. But Aaronovitch has never been a member of the Labour Party, although he was for many years a very, very active member of the Communist Party. He is, however (and as that background suggests), a leading neoconservative. So, that's all right, then...