Cyril Smith was held at paedophile sex party - but police were told 'cover it up or face prosecution under the Official Secrets Act'

Cyril Smith was arrested at a sex party with teenage boys, according to an investigation.

The 29-stone Liberal MP was snared by an undercover police operation gathering evidence of child abuse.

Sources say officers had targeted several properties in south London suspected of hosting sex parties.

According to BBC’s Newsnight, Smith was seized at a house in Streatham. But within hours of being taken to a police station he was released, with officers being ordered to hand over all their evidence – including notebooks and video footage .... http://www.dailymail.co.uk