I've been saying it for years - now the evidence:
Thatcher protected Tory MP suspected of abusing children, MI5 files reveal
Margaret Thatcher personally supported one of her MP’s who had an alleged “penchant for small boys”, MI5 files disclosed to a public inquiry reveal.
An MI5 lawyer told the Independent Inquiry into Child Sexual Abuse (IICSA) it was “a matter of regret” that the service considered only the national security implications of allegations of possible child abuse by Peter Morrison, Conservative MP for Chester, and did not pass information to the police.
https://www.independent.co.uk/news/uk/politics/inquiry-child-sexual-abuse-peter-morrison-paedophile-tory-mp-thatcher-mi5-westminster-police-a8818151.html