6 DECEMBER 1986, Page 29

Sir: Paul Johnson made much play with the Media Monitoring

Unit's brilliant insight that Channel 4's Union World series had a `left-wing bias' rating of 45.5 per cent. Leaving aside the question of the MMU's definitions of `left-wing', `bias' and 'politic- al', some people might think it odd that neither the MMU nor Mr Johnson himself chose to refer to the fact that Channel 4 transmits another weekly series called The Business Programme. I wonder what the bias rating might have been had these scrupulous scholars chosen to include this series in their first list for monitoring. Paul Johnson hails the report as `abun- dantly rich and detailed material'. I am sorry that a journalist with so keen a nose for humbug, should on this occasion have been so unaccountably credulous.

Liz Forgan

Deputy Controller of Programmes, Channel 4, 60 Charlotte Street, London W1