Panic on the streets of London?...
'Detectives who had gained evidence of child abuse against the Liberal MP Cyril Smith and a member of the intelligence services were threatened with the Official Secrets Act if they did not drop the case, a police whistleblower has claimed.
The undercover police operation was scrapped shortly after detectives moved in to make arrests, the police source told BBC’s Newsnight programme.
Police officers questioned Smith during the inquiry in the early 1980s, which targeted properties in south London where it was suspected sex parties were hosted involving teenage boys, but he was released within hours of being taken to a police station, it said. Smith and others were caught abusing children, but officers were ordered to hand over all their evidence – including notebooks and video footage – and warned to keep quiet about the investigation or face prosecution under the Official Secrets Act.'
http://www.theguardian.com/politics/...-whistleblower