 While at Huddersfield he contributed to the club gaining promotion from the Second Division in 1919–20, played in the 1920 FA Cup Final and again in 1922, this time on the winning side.He was the club's leading League scorer in the 1921–22 season.Islip moved to Birmingham in November 1923 for a fee of £1,500, and in his first full season was joint leading scorer, but the prolific partnership between George Briggs and Joe Bradford left him on the sidelines.