This is interesting from Channel 4's former doorstepper-in-chief Michael Crick:
[Richard] Sambrook was asked by the board of Channel 4 to do a similar inquiry into bias on C4 News, though it was all a bit rushed. His report - kept secret - concluded there wasn’t enough diversity in the backgrounds and outlooks of people on the programmes, especially senior staff.
Among Sambrook’s recommendations was that the programme make a “senior counter cultural appointment” - either a top presenter or editor - to balance “the uniformity of editorial attitude and approach in the [C4News] newsroom”. I’m not sure that would have worked.
“Senior counter cultural appointments” at, say, Newsnight? It's an intriguing suggestion, but I'm not sure it would work either. Such outsiders would probably get a very frosty reception.