After the War, the school took over buildings on the site of the present-day Hard Courts and Music Department, built for civil defence, including several air raid shelters and huts, as well as buildings formerly belonging to the defunct Milham Ford School, and these formed part of an expanded school which by now had several hundred pupils. A building campaign in the 1950s represented the first wave of a gradual expansion and enlargement of the school, commencing in 1951 with a five-building concrete block, and more significantly, between 1955 and 1957, the construction of the three-storey teaching block which is near the modern Colin Sanders building.