A FORMER housemaster at an approved school for young boys was jailed yesterday for three years for an indecent assault on a teenager and violent attacks on others.Neil Wardell, 44, was also banned from working with young people again and will be put on the sex offenders’ register for life on his release.Wardell, now of Alexandria, Dumbartonshire, in Scotland, worked at the Ty Mawr approved boarding school, in Gilwern, outside Abergavenny, between 1982 and 1988.