Theory? The BBC fired Radio Ballads producer Charles Parker. They also failed to renew Michael Rosen's contract when his time as graduate trainee was up, though his career is somewhat recovered nowadays (or so's the Word Of Mouth). I had the privilege of working with Charles Parker towards the end of his life on a dramatised Ballad of John Axon at colleges. His experience, as related to me, made McCarthyism seem like park-walking.