In  1985, age 45 years, Duff was imprisoned for 2 years for sexual offences against 4 boys between the ages of 13 and 15 years and abusive images of boys were found at his home.  He had a prior conviction in 1969 for similar offences. Convicted in Croydon, he was rehoused in Islington on release from prison hostel and lived close to the Hot House in Hornsey Road.  Islington Police investigated allegations against him in the early 90s but this led to no prosecution.

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