[1][2] However, after a single season in the Central Alliance the club transferred to Division One of the East Midlands Regional League.

[3] The league became the Midlands Regional Alliance in 1985, and the club won the Premier Division and Challenge Cup double in 1989–90.

[6] The 2005–06 season saw Harrowby finish bottom of the Premier Division, after which they dropped back into the Grantham & District League.

In 2009 they were renamed Grantham Rangers, but folded at the end of the 2009–10 season, which had seen them finish bottom of the Supreme Division.

After beating Clipstone 4–1 in the semi-finals, they defeated Newark Town 2–1 in the final to earn promotion to the Premier Division North.