In 1939 the Rampart Boat Building Company of Southampton (then Rampart Boatbuilding Works) had provided 9 of its ships for war use.
"Lady Lou" emerged unharmed from the Dunkirk evacuation and was deployed as a coastal patrol vessel. She was finally released from service in 1942 and repurchased by her pre-war owner. The repairs and changes that happened during that time did not affect her original design. This is evident from the drawings published in November 1936 in the magazine 'De motorboot'.
Rampart Boat Building was an enterprising family business that started building dinghies before World War I and then experimented with buying ex-Admiralty boats to convert them into motor cruisers. In 1926 they built their own 30 'motor cruiser. In 1935 they designed and built a 40 ′ twin screw motor cruiser that would be the precursor to all of their later designs.
Since 2015, the "Lady Lou" is owned by the past-commodore of Dunkirk Little Ships!