Great article on this: http://www.guardian.co.uk/tv-and-radio/tvandradioblog/2013/may/14/the-fall-northern-ireland-troubles.
Until the Scottish question, though, it was in Northern Ireland during the Troubles, that the tension between UK remit and viewers in a constituent nation was at its greatest. The word behind the BBC's first initial was explosive to many nationalist viewers and yet the loyalist audience was often appalled by what it perceived as republican sympathies in some programmes. These irresolvable pressures led to such crises as the events in the summer of 1985, when a documentary in the Real Lives series, which featured Martin McGuinness of Sinn Fein, was postponed for four months by the BBC governors under pressure from the Conservative government. Three years later, the Thatcher government failed in its attempt to prevent transmission of the Thames TV documentary Death on the Rock, which investigated the killing by the SAS of three IRA members in Gibraltar, but, probably not coincidentally, Thames later lost its ITV franchise through a new Thatcherite bidding process.