Gladys Carson took part in the ASA National Long Distance Championship, over five miles on the River Thames, as a 16-year-old in 1919, and finished seventh. In 1922 and 1924, she finished third and second respectively. Primary school teacher Carson had three other ASA podium finishes, including the 200 yards breaststroke in 1922 and 1926, when she finished third on each occasion She did, however, win the title as an 18-year-old in 1921. She was also a Midlands ASA breaststroke champion and, after finishing third behind Irene Gilbert and Lucy Morton in the 1924 Olympic trial at Blackpool, she went on to enjoy her finest moment internationally when she won the 200 breaststroke bronze at the Paris Games behind gold medallist Morton and the American Agnes Geraghty.