One day last spring, the investigative journalist Alex Renton received an unusual email. It contained a scan of a typewritten document marked with the dates 1983/1984, which appeared to be an authentic list of members of an organisation known as the Paedophile Information Exchange (PIE). PIE operated legally in the UK for a decade from 1974 until the mid-1980s, lobbying publicly for a change in the age of consent proposing in 1977 that there shouldn't be one at all. PIE members received a magazine, Magpie, which included news, non-nude photographs of children and a "contact page". PIE was disbanded in 1984 after several prosecutions relating to child pornography and conspiracy to promote indecent acts via the contact page. There were more than 300 names on the member list that Renton now had in his possession, a number of which he already knew. The police had the list from the late 1970s, Renton says. He and his team were able to find further information for around 45 per cent of the names on the list and discovered that half of these had convictions or cautions, or had been charged and died before trial, for sexual offences against children. And 65 members, Renton notes, "worked in what we now call regulated professions, which are child facing. "We've got about 30 teachers, as well as social workers, clergy, doctors. There's a number of eminent psychologists and quite a large sector of people in youth work."