[2] Towards the end of the war he played for Gravesend and the Army Command sides against an Australian Services team,[3] and in July 1945 he first appeared for a Kent side in a one-day match against Northants, having played for the Club Cricket Conference earlier in the same month.
[4] He was selected for Kent's Second XI in two matches at the beginning of the season, opening the batting on each occasion.
[2] With the First XI struggling with "inconsistent form, particularly in the batting department"[5] and without a win in five matches, Gunn was called into the side for the team's fifth match of the season, a County Championship fixture against Nottinghamshire at Gillingham at the beginning of June.
[4] He made the second highest score of Kent's first innings, making 39 runs, in the side's first victory of the season and, after missing an away fixture against Hampshire was retained in the team for their two home matches at Gravesend later in the month.
[2][3][4] In 1950, Gunn emigrated to Australia, working initially as an import and export agent in Sydney.