Further land on the northern side of the school was resumed in 1945, and later the gymnasium was erected on part of this land, and completed in 1954. Increasing enrolments and a lack of specialist rooms led to a major extension of the school buildings again being undertaken. The new structure, opened in 1969, contained six science laboratories, two music rooms, three art rooms, two technical drawing rooms, two woodwork rooms, a metalwork room, a new library and several classrooms, new toilets and a new canteen. This extension was connected to the old building via overhead walkways, and due to it being constructed around a central courtyard, quickly gained the name of the 'doughnut' block.