 In the 1930s major extensions were again carried out, completed in June 1937, which included a large assembly hall and a science wing, allowing the school to accommodate 300 pupils; this number rose to 370 by 1953.In 1951 the status of the school changed from "Aided School" to a school wholly controlled by Lindsey County Council.On the retirement of Thomas in 1953, C. Shaw was appointed headmaster.