The British WWII amphibious transport vehicle was the Terrapin. Officially called the 4-ton amphibian, it was developed to move troops and supplies between ships, beaches, and inland waterways.
Thornycroft designed the vehicle after Britain faced shortages of American-built DUKWs. Morris Commercial manufactured the Terrapin, which used an unusual 8×8 layout and twin Ford V8 engines. Its large body offered useful carrying capacity, but the high driving position and difficult handling made it less popular than the DUKW.
Terrapins saw combat service in 1944, including operations around Antwerp and the Battle of the Scheldt. They carried Canadian and British infantry across rivers and flooded terrain, notably during the Walcheren campaign and Operation Vitality II. The vehicle was associated with the Royal Engineers and the 79th Armoured Division.
A common mix-up is to choose DUKW, the famous American amphibious truck used extensively by Allied forces. The DUKW was American-designed and mass-produced; the Terrapin was the British answer to the same broad logistical problem. After the war, surviving Terrapins even helped provide public transport on flooded Walcheren until about 1946.