It's the contention of the Glasgow Media Group, re-stated in its latest book, Really Bad News, that TV news is biased against the left. It has been called a ' shadowy guerrilla force on the fringe of broadcasting ', but this evening its spokesman, Greg Philo , with Michael Meacher , mp, emerge into the spotlights of a Lime Grove studio to argue their case against an audience of BBC and ITV news-men, reporters and producers.