Gladwin's career total of 1,653 wickets puts him 60th on the all-time list of wicket-takers, and his 1952 match performance of 16 for 84 against Worcestershire is the second best in post-World War II county cricket, being bettered by only one run by Tony Lock four years later. His bowling average was 18.30, and his best innings performance 9 for 41.