Joan Bakewell has called for broadcasters to adopt "a clear moral framework" to help them recover from the recent tide of taste and decency and trust scandals.Delivering the annual Hetherington Memorial Lecture, in honour of the former Guardian editor Alastair Hetherington in Edinburgh last night, Bakewell said the "recent Jonathan Ross and Russell Brand scandal demonstrates that a continuing moral crisis haunts the BBC" and branded it a "moral muddle".The veteran broadcaster and writer added that "Channel 4 and ITV too are having their own integrity questioned", as an "insidious falling away of moral integrity has crept into broadcasting to such an extent that its leaders seem unsure how to react and what criteria of behaviour and judgment to invoke"."I ...