Norma Levy was a prostitute who slept with Lord Lambton, then Under-Secretary for Defence in Ted Heaths Conservative government. Photographs were taken of the liaison and attempts made to sell them to the papers.
In the aftermath, Lord Lambton resigned. Due to confusion with the Jellicoe building and the minister, George Jellicoe (the Lord Privy Seal and Leader of the House of Lords) also resigned after admitting casual affairs with call girls .
Norma named a third and possibly a fourth minister but this were denied by the Government . Police were told to investigate the Sunday Peoples dossier by Home Secretary Mr Carr, but did not contact Norma Levy .
To add to the intrigue a German “hostess operator” Hans Ulrich-Altoff was tried for pimping in Germany  and had claimed to work with Norma and that they had an arrangement to swap girls between English and German outfits . Part of the charges against Hans were that he tried to entice children to pose for erotic pictures, which he denied .
In 2004 the BBC stated that “Documents released by the National Archives on Thursday under the 30-year rule show MI5 feared a scandal and Mr Heath had ordered a Security Commission inquiry into the implications of the affair” .
In 2007 Norma Levy was interviewed by the Independent, she maintained that there was a third minister who used call girls and named him. The newspaper, which knows but has not divulged the minister’s name, describes him as “today one of Britain’s most respected and best-known elder statesmen”. He was said to use a blonde German girl called “Rocha” .
There is National Archive Document PREM 15/1906 labelled Consideration of publicity for statement made by Norma Levy concerning third minister in the Lambton/Jellicoe affair 
Colin Levy, Normas husband, has been described as a taxi driver ‘I never saw him drive any cab,’ she scoffs. In fact, she says, he never seemed to do much work at all, but he always had plenty of money, and a yacht in St Tropez. He also travelled extensively, went out at strange times, and mingled with mysterious people, prompting Norma to believe he was somehow involved with the security services.
The Mail continues “Norma insists, not unconvincingly, that she had no part in the plot to trap Lambton on film. The first she knew about the notorious photographs taken in her bedroom, she says, was when a man – whom she presumes to have been a government agent – called at the flat, and suggested that she move abroad because a scandal was about to break.”
Norma Levy died in 2007 of pancreatic cancer . She was terrified powerful enemies were still out to get her’. Did they?
Heath has also slept with prostitutes  so depending on the timing of his use, could have been lucky to get away without scrutiny. The cabinet also had Reg Maudling, who previously had to resign in the Poulson affair and Keith Joseph who has been linked to child sexual abuse 
This leaves many questions some of which are below.
What is in the National Archive Document PREM 15/1906?
Who was the third minister named by Norma Levy? and who the possible fourth?
Was the Heath cabinet stuffed with users of prostitutes?
What were the results of the Report of the Security Commission inquiry?
What happened to Hans Ulrich-Altoff, what were his links to photographing children and his links to English pimping and prostitution?
At the time of Altoffs trial Heath was on a private visit to Bavaria -what was he doing, especially in view of the allegations about him being a DVD agent? 
What was the role of Colin Levy?
What was the role of MI5, especially given all the indications of the “elite” child sexual abuse paedosadism scandal that MI5 oversee it for blackmail purposes?
Time for the citizen sleuths to dig out more…
Additions since publication
via @cassandracogno . There appears to be also a call boy scandal which was overshadowed by the Lambton scandal
Please note that victims of abuse may be triggered by reading this information. The Sanctuary for the Abused [A] has advice on how to prevent triggers. National Association for People Abused in Childhood [B] has a freephone helpline and has links to local support groups. Other useful sites are One in Four [C] and Havoca [D]. Useful post on triggers [E] from SurvivorsJustice [F] blog.
 1973 May 31 via Google Sydney Morning Herald Sex Trial Told of Girl Swap Plan https://news.google.com/newspapers?nid=1301&dat=19730531&id=bfhjAAAAIBAJ&sjid=qO
 1973 May 30 The Age Definitely no Third Man UK assured https://news.google.com/newspapers?nid=1300&dat=19730530&id=IthjAAAAIBAJ&sjid=0p
 2007 Jan 27 Independent Third minister in 1970s sex scandal, says Norma Levy http://www.independent.co.uk/news/uk/politics/third-minister-in-1970s-sex-scanda
 National Archives Consideration of publicity for statement made by Norma Levy concerning third minister in the Lambton/Jellicoe affair http://discovery.nationalarchives.gov.uk/details/record?catid=8399644&catln=6
 2007 Jan 26 Daily Mail Call girl who nearly toppled a government reveals all http://www.dailymail.co.uk/femail/article-431781/Call-girl-nearly-toppled-govern
 Wikipedia George Jellicoe https://en.wikipedia.org/wiki/George_Jellicoe,_2nd_Earl_Jellicoe
 Cathy Fox Blog Michael Shrimpton on Ted Heath https://cathyfox.wordpress.com/2015/08/04/michael-shrimpton-on-ted-heath/
 Daily Mail Lonely death of call girl who brought down the Government: Norma Levy destroyed the careers of two Conservative ministers. And now she’s taken secrets of a THIRD Tory grandee – who’s still alive – to her grave http://www.dailymail.co.uk/news/article-2519622/The-lonely-death-girl-nearly-brought-Government.html
 2015 Aug 15 Mirror Edward Heath ‘had male prostitutes delivered to Westminster hotels’ claims former madam http://www.mirror.co.uk/news/uk-news/edward-heath-had-male-prostitutes-6260685
 2014 Jul 13 Mirror Tory child abuse whistleblower: ‘Margaret Thatcher knew all about underage sex ring among ministers’ http://www.mirror.co.uk/news/uk-news/tory-child-abuse-whistleblower-margaret-3849172
 1973 May 23 The Morning Record Sex Drug Scandal cont. Part 2 https://news.google.com/newspapers?nid=2512&dat=19730523&id=I_FcAAAAIBAJ&sjid=xlkNAAAAIBAJ&pg=1079,3911193&hl=en
[A] Sanctuary for the Abused http://abusesanctuary.blogspot.co.uk/2006/07/for-survivors-coping-with-triggers-if.html
[E] SurvivorsJustice Triggers post http://survivorsjustice.com/2014/02/26/triggers-what-are-they-and-how-do-we-work-through-them/
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