"Operation Yewtree is a police investigation into sexual abuse allegations, predominantly the abuse of children, against the British media personality Jimmy Savile and others. The investigation, led by the Metropolitan Police Service, started in October 2012. After a period of assessment it became a full criminal investigation, involving inquiries into living people, notably other celebrities, as well as Savile."
https://en.wikipedia.org/wiki/Operation_Yewtree
Really one for the "Dark side of Hollywood" thread. In the context of Grotsnik's post, a distressing number of British TV and radio personalities of the 80s (contemporary with Keith Chegwin's peak of fame) turned out to have had a dark side.