BRITISH WATERWAYS BOARD.

Flags of the World dates the original Docks & Inland Waterways Executive flag to 1949. The museum specimen is dated 1955–67 and measures 1295.4 × 1828.8 mm.

A change around 1970 brought the wave-symbol livery, with varied funnels. Regent’s Canal pleasure craft and tugs used B563 and B564; British Coastal Ships, Tugs & Trawlers assigns B563 to Gloucester, Goole and London vessels.

B566 is assigned to Bristol and Avonmouth by Coastal Ships and to Gloucester by ABC British Tugs.

Both references assign B567 to Fort Augustus, described in the source as East Coast of Scotland.

B565 is given for the Hull tugs.