Port of London Authority Blue Ensign. Rope and toggle attached.

The Port of London Authority was established in 1909 and was entrusted with the duty of making good any deficiencies in the port’s accommodation, equipment and service both for ships and goods; to carry out all conservancy duties over sixty-nine miles of the tidal Thames and exercise the powers hitherto vested in the Watermen’s Company relative to the registration and licensing of craft and boats as well as lightermen and watermen.