Platt's Eyot included yachts and – during the two world wars – a large number of small vessels for the Royal Navy. The yachts included Enola (1928), Estrellita (1934) (now called Rake's Retreat), (1935), and Moonyeen (1937). The pre-war motor yacht Prunella may also have been built at Hampton. These four have survived and are now recorded on National Historic Ships' National Register. In the inter-war years there was still some construction for the Royal Navy at Woolston, but the yard also built civilian ships, like the ferry for Uganda in 1930. She apparently still survives, but as a half-submerged wreck on the shore of Lake Albert. When World War II broke out, production was stepped up again, and the yard built corvettes and destroyers. Production was delayed by several bombings, probably influenced by the yard's proximity to the Spitfire-building Supermarine factory, also situated in Woolston. That factory was bombed extensively in the beginning of the war, and Thornycroft's yard received its fair share of the bombs. Among the more notable ships built by the yard in the war years were the two destroyer escorts, HMS Bissenden and , (Type IV) with better stability than their sisters. The largest naval vessel built at Woolston during the war years was the fast minelayer of 2,650 tons, with turbines capable of and a speed of . The first seaworthy Assault Landing Craft (ALC), later renamed LCA, Landing Craft Assault, ordered built for the British Navy were by Thornycroft. The first prototype ALC No 1 was built by J. Samuel White of Cowes to a design by Fleming Jenkin, but it was not very successful. Thornycroft's design was much closer to what the navy wanted, with its low silhouette, silenced engines and shallow draught. Designated ALC No 2, it was long overall and driven by two Ford V8 engines of each. The design was slightly modified by the Admiralty and some 1,929 were built during World War II. In 1944 sixty were being built each month. The LCA was reasonably seaworthy, so long as waves were less than high. In heavy seas the situation could become critical and a number of LCAs converted to support craft disappeared in the choppy seas of D-Day, 6 June 1944. In 1944 267 were lost (out of 371 losses during the whole war). In 1955, the company built , a passenger ferry built for the Isles of