In 1970 New Bradwell St Peter moved up to Division One of the South Midlands League. Under the guidance of manager Brian Gibbs the club were Division One champions in the 1976–77 season, earning promotion to the Premier Division where they spent four seasons before finishing bottom of the division in 1980–81, resulting in relegation back to Division One. The club were Division One champions again in 1983–84, this time under the management of Malc Burridge, and were promoted to the Premier Division. They finished bottom of the Premier Division in 1992–93 and were relegated to the Senior Division. In 1997 the league merged with the Spartan League to form the Spartan South Midlands League, with the club placed in the Senior Division.