On Radio 4's PM programme (started at 5pm) last night there were several interviews that showed the extent of the cover up of child abuse around Cyril Smith (and others). The account of the newspaper office being visited by Special Branch officers, and the revelations by a chap that was a serving Police Office at the time are quite staggering. People who tried to reveal what was going on were threatened with prosecution under the Official Secrets Act.
I think it is still available on iplayer, and I would recommend that you have a listen, as it gives a better account than I could here.
There are probably people still alive who could reveal what was known at the time, but it was implied that some were still frightened to come forward.
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