 He was educated at Abingdon School.He was the leading wicket taker for the School's first XI in 1993 taking 46 wickets at an average of 10.37 and was awarded Colours that season.Gannon's debut in the Second XI championship came courtesy of a Gloucestershire XI match against Middlesex, however, Gannon took no part in the match, at no time being called to bat or bowl.