Llewellin was accused of failing to take appropriate action or to launch an investigation into General Synod member Jeremy Dowling in 1986. Llewellin was working in the Diocese of Truro from 1985. Dowling in 2015 was convicted of sex offences against boys whilst a school teacher in the 1970s. A 2018 case review found, “There is no doubt that there were a number of missed opportunities for the diocese of Truro to undertake its own investigations into the allegations made in 1972 against Jeremy Dowling.” Llewellin was one of four bishops in the diocese who failed to take action. When questioned by the inquiry stated he had no recollection of reading Dowling's file which contained details of past allegations that the Director of Public Prosecutions decided not to prosecute Dowling for in 1972.[13]