Growth continued through the world wars, with 700 boys by 1947 and five scholarships for pupils to pursue university education. An outdoor swimming pool was constructed in the 1920s and remains in use. In 1966 Labour-controlled Colchester Borough Council put forward proposals to close Colchester Royal Grammar School and Colchester County High School and move to a comprehensive system, but this was rejected by Essex County Council. The educational expansion of the 1960s allowed the construction of new classrooms and a gymnasium.