In 1949, the club purchased eleven acres of land off Northfield Road. This became known as Lancaster Close. Early in 1970, seven acres were sold and the proceeds used to finance the construction of a new clubhouse and dressing rooms. In 1953, Thatcham became a founder member of the Hellenic League and was promoted to the Premier Division on three occasions as Division one champions in 1958–59, 1964–65 and 1972–73. In 1974, the club changed its name from Thatcham. In the 1974–75 season the club won the Hellenic League Championship and the Premier Division Cup; in addition Thatcham also reached the final of the Berks & Bucks Senior Cup losing to Wycombe Wanderers. However, Thatcham was awarded the Cup by default because of a dispute between Wanderers and the Berks & Bucks FA.