In 2008, he played Second XI cricket for Surrey and Worcestershire before joining Northamptonshire until the end of the season. He made his debut for Northamptonshire against one of his former trialist clubs, Surrey on 8 September. At the start of the 2010 season, Harrison was a first team regular and kept wicket due to Niall O'Brien being on international duty and David Murphy still at University.
In 2008, he played Second XI cricket for Surrey and Worcestershire before joining Northamptonshire until the end of the season. He made his debut for Northamptonshire against one of his former trialist clubs, Surrey on 8 September. At the start of the 2010 season, Harrison was a first team regular and kept wicket due to Niall O'Brien being on international duty and David Murphy still at University.