It was after a choir practice when Cave found a boy by himself in the chorister’s room and groped him. * Dilworth School: Former chaplain groomed and sexually abused boys for 15 years * Dilworth School: Convicted sex offender carried on teaching for almost 20 years * Dilworth School: Ex-assistant housemaster admits sexually abusing boys in his care * Dilworth School administrators knew staff would abuse boys 'again and again' In 1971, Cave was a boarding house tutor and relieving teacher at Dilworth, a school that prides itself on providing high-end education to vulnerable boys from broken homes.