The following season saw Dover Athletic clinch the Isthmian League Premier Division title with the help of Collin's 21 goals and he extended his stay at Dover in May 2009 by signing another contract with the Kent club.
In the next season, Dover Athletic won the Isthmian League Premier Division championship due to Collin's goal-scoring prowess of 21 goals, and he continued his association with the club by renewing his contract in May 2009.