British Tv icon Stephen Fry stunned guests at a political fundraiser on Wednesday (09Jul14) by taking aim at a high-profile investigation into allegations of sex abuse against some of the U.K.'s most popular stars.

Operation Yewtree was launched following the shocking revelations of Tv and radio host Sir Jimmy Savile's widespread historic sexual abuse, and it has led to the successful prosecution of stars including entertainer Rolf Harris, Tv host Stuart Hall, and Pr guru Max Clifford for offences committed in the 1960s and '70s.

However Fry, who was hosting the Labour Party event at London's Roundhouse, reportedly reminded guests that "fewer than half" of those held in the probe have been convicted, urged attendees to remember "people are innocent until proven guilty", and called for tougher punishments for those who make false claims.

Attempts to prosecute comedians Jim Davidson, Jimmy Tarbuck and Freddie Starr, as well as Coronation Street actor William Roache, failed after months of negative publicity.

One guest at the event tells Britain's Mail on Sunday newspaper, "It was all a bit awkward. There was a smattering of applause, but mostly there was just this deadly silence."

Fry's friend, BBC DJ Paul Gambaccini, was arrested in October (13) under Operation Yewtree on suspicion of historical sexual offences but was released on bail and was later cleared of any wrongdoing, and Fry is understood to be angry that the failure to charge Gambaccini has received less publicity than his initial arrest.