Paedophile back in jail after assaulting two children and drugging another He didn’t tell the mother about being a sex offender Benjamin Johnson, a registered sex offender, has been sent back to prison for six years. | Photo: Humberside Police A registered sex offender has returned back to prison for six years after failing to comply with release requirements when he sexually assaulted two children. Benjamin Johnson, 34 and from Scunthorpe, went to extensive measures to conceal a year-long relationship with a woman who had three children, who he had overnight stays with right up until his arrest in April 2020. He pleaded guilty to sexually assaulting two children at Grimsby Crown Court on Monday and was sentenced to six years back in jail.