Explosive new revelations of the police and establishment cover-up over Cyril Smith ’ s paedophile past emerged last night . A retired police officer said the 29-stone Liberal MP was protected by a sex-offender sergeant after he was caught at a sex party with two boys . Smith walked free and the retired officer – then a probationary beat bobby – was threatened with the Official Secrets Act and told to stay silent by his colleague Don Mackintosh , who himself turned out to be a paedophile . Paedophile : A detective says he was ordered to cover up Cyril Smith 's crimes by senior colleagues . Yesterday , after 27 years , the former Greater Manchester officer broke cover to reveal his anger amid growing fury over how Smith repeatedly escaped prosecution during four decades of appalling abuse . His revelations mean Smith escaped possible prosecution at least eight times after orders were made at the highest level to cover up his crimes . Last year the Daily Mail blew the lid off Smith ’ s perverted past when it serialised Simon Danczuk ’ s book , Smile For The Camera : The Double Life Of Cyril Smith . The Mail revealed how the Rochdale MP had repeatedly escaped police and court action for decades despite leaving a trail of young victims in his wake . Don Mackintosh , who turned out to be paedophile , threatened the officer with the Official Secrets Act and told him to stay silent . The strong suggestion has always been that the establishment conspired – via the police and security services – to protect the MP who was seen as a useful bulwark against the hard Left . Last night Greater Manchester Police announced a new inquiry into the claims . They were made just days after it was revealed that Smith had been arrested at a similarly sordid event in London but was let off . And yesterday another police force , Northamptonshire , disclosed that it , too , was probing suggestions that it let Smith off the hook in the 1980s when it discovered child pornography in his car . Labour MP Mr Danczuk said last night : ‘ More police officers are now coming forward to share their anger and disgust at how there was simply no appetite to prosecute Cyril for child abuse . ‘ Cyril Smith was a prolific abuser of children and I ’ ve no doubt that he was on the radar of a number of police forces. ’ Earlier this week the independent police watchdog revealed it is overseeing 14 separate claims of cover-ups and corruption in historic sex abuse case by Scotland Yard . Prime Minister David Cameron has already guaranteed that police whistle-blowers will not be prosecuted under the Official Secrets Act if they come forward . The retired Greater Manchester officer was threatened with the Official Secrets Act after he discovered Smith at the party with a prolific sex offender and two drunk teenage boys in 1988 . The officer said : ‘ I had been in the force about six months . The occupier was about 70 and seemed an old granddad type . Earlier this week the independent police watchdog revealed it is overseeing 14 separate claims of cover-ups and corruption in historic sex abuse case by Scotland Yard . 'In the house was Cyril Smith and a police sergeant in civilian clothes . The officer identified himself and showed his warrant card , saying he was there “ on other business ” . ‘ There seemed to be a party going on , with two young lads there . Smith and the officer left . The boys , aged about 14 to 15 , were drunk . 'One was missing from a children ’ s home . I called for a van and took him back . The other lad walked off . ‘ The old man was arrested and I took him to the main police station in Stockport. ’ The following day , the officer says , he was called to a meeting by a senior officer and his mentoring officer , Sergeant Mackintosh , who was later exposed as a prolific child abuser and who was found hanged in his home last year . The officer said : ‘ I was told I would break the Official Secrets Act if I told anyone . In no uncertain terms I was told to say nothing . They knew Smith was there and knew who he was. ’ Greater Manchester Assistant Chief Constable Ian Wiggett said : ‘ These fresh allegations will now be examined by Operation Clifton , a criminal investigation into how previous reports of child sexual abuse were handled or allegedly covered up . These allegations are concerning and will be treated seriously . ’
Retired police spokesman said MP was protected by sex - trafficking sergeant . Was investigating MP but he was turned down by ' very senior officer ' Don Mackintosh , who turned out to be paedophile , told officer stay silent . Rochdale police had repeatedly escaped arrest and threatened action for decades . Northamptonshire Police discovered child pornography in his car in 1980s .