Under the long headship of Logie Bruce Lockhart (1955–1982), there was a further period of change and expansion. Kenwyn, a new Junior School House, was built and opened in 1958. The bridge over the Cromer Road was opened in 1962, and was initiated after the death of Kirsty, LBL's daughter, while crossing Cromer Road in front of Howson's. Tallis, a new boys' house named after John Tallis, Master of the school for more than thirty years in the first half of the seventeenth century, was built and opened in 1963 as were the biology classrooms and music rooms. Oakeley became the first girls' house in 1971, when girls were first admitted to the Sixth Form only. The school became fully co-educational in the 1970s.