A former Dilworth School chaplain serving a prison sentence for historic sexual abuse has had his prison sentence lengthened

Ross Douglas Brown has pleaded guilty to a new wave of charges bringing his total victims to 19.

Brown is two years into his six and half year sentence and has had seven months added on.

The offending took place between 1987 and 2002.

Alongside involvement in the school he was also involved with Scouts and the amateur theatre company the Auckland gang show.