A former teacher has been jailed for the abuse of two students at a prestigious northern NSW boarding school in the 1960s. Judge Leonie Flannery sentenced Gardiner to 13-and-a-half years in prison, with a non-parole period of eight-and-a-half years, in Sydney's Downing Centre District Court today. Judge Flannery acknowledged defence counsel Philip Boulten's submissions but agreed with the Crown prosecutor …