A former teacher at Christs Hospital School, Horsham, has been sentenced to four years for a sexual offence against a pupil at the school 42 years ago.
Roger Martin, 83, retired, of Palgrave Road, Great Dunham, Kings Lynn, was convicted after an eight-day trial at Hove Crown Court, of committing an indecent assault on the 10-year-old boy pupil at the school between September and December 1976.
He will be a registered sex offender indefinitely.
The prosecution followed an investigation by officers from the Sussex Police Complex Abuse Unit after information was received for the first time in November 2017.
Detective Sergeant Rebecca Wilde said; "It became clear that Martin who was the boy's housemaster, took advantage of his natural vulnerability for his own sexual gratification, hoping that it would not come to light - for more than 40 years he was right.
"This victim had kept the experience to himself for more than 40 years, only coming forward when he learned of similar cases involving other teachers at the same school.
"We have had full co-operation from the School throughout the investigation and we make it clear that the case relates to a period nearly 43 years ago, having nothing to do with current or recent pupils or staff at the school.
“Anyone who is the victim of sexual abuse, now or in the past, can contact us at any time, online or by calling 101 and can arrange to talk in confidence to experienced investigators.”
Further advice and sources of support are available on the Sussex Police website.