 Shortly after the war the College began to rebuild itself, and, in 1945, St John's College Sixth Form was founded.The school became a Catholic direct grant grammar school under the Education Act 1944 for many years while maintaining its independent status as a member of the Association of Governing Bodies of Public Schools.The site continued to advance from 1958 to 1968 with the opening of the Jubilee block on the College's 50th anniversary.