apart from the various rumours over the years, I think the Newsnight report was the first - when it was spiked its findings found their way into The Oldie this year.
http://order-order.co...er-up-scandal-coming/
I assume a victim tried telling the BBC, only to see its investigation suppressed, for whatever reason. Plus at least one went to the police, but with the same outcome.
But as Grmot says, the rumours go back a long way, and have evidently been ignored for a long time.