 He returned to playing just three days later by signing for Football Conference club Boston United, making his debut the same day in a 2–2 home draw with Scarborough.Mills made eight appearances for Boston before being appointed the player-manager of Southern League Premier Division club Tamworth on 12 January 2001.He was not in charge for the following day's 3–0 home defeat to Boston in the FA Trophy, with Tim Steele continuing as caretaker manager for this match.