 He joined the youth system of hometown club Grimsby Town at the age of 12 and he signed a professional contract in August 2006.He made his first team debut as a substitute in the 67th minute against Boston United on 5 August when his side were 2–0 down, and after scoring two goals, with the first coming from his first touch of the game, Grimsby went on to win 3–2.Bore's first hat-trick came in the away game against Boston in February 2007, which finished as a 6–0 victory.