You know in the autobiography that JS wrote back in 1974 he didn't keep it a secret that he liked to bed young girls and three in a bed with them either. The BBC knew what he was like and wouldn't have been a surprise to them when they saw his book at the time.
Not chipped in on the thread for a while but that, for me, is the 'elephant in the room' and summarizes the culture of the BBC 'back in the day' up until relatively recently. It's the whole 'hiding in plain sight' thingy all over again. People just didn't want to see.