 As a consequence of this expansion, Millest oversaw a number of building projects, including a sports hall (1970–1971), science laboratories (1978), additional classrooms and food technology classrooms.Millest was succeeded in 1986 by Christine Sibbit, who led the school until her retirement in 1999, when she was succeeded by Morag Chapman, the last headmistress of the school.During Sibbit's time, the school closed its boarding houses and became a day school only.