Tory MPs who failed to back the Government in a crunch vote on fracking last night will be punished, Downing Street has said.Philip Cowley, a professor of politics at Queen Mary University London, said that "proportionate discipline" would be a "meeting without coffee or a stiffly worded letter". Almost all non-trivial rebellions involve breaking a three-line whip. If we were to withdraw the whip for that, we would soon have very small parliamentary parties."