 He played several non-class games and some first-class games for Warwickshire when they joined the league, his last match being in 1895.Docker had joined his brother Frank Dudley Docker in Docker Brothers in 1886 and in 1898 became a director of Metropolitan Railway Carriage and Wagon Company of Saltley Birmingham before the amalgamation of carriage companies by his brother in 1902.He was President of Warwickshire County Cricket Club from 1915 to 1930 and in 1923 was High Sheriff of Warwickshire.