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The Patchett Machine Carbine Mk I is the predecessor to the Sterling SMG. It was developed by George William Patchett, who was an employee of the Sterling company. At the beginning of the wear, Sterling was making Lanchester SMGs, and Patchett began in 1942 working on a new design that was intended to be simpler, cheaper, and lighter than the Lanchester. He used the receiver tube dimensions from the Sten and the magazine well and barrel shroud form the Lanchester. His first prototypes were ready in 1943, but it wasn’t until early 1944 that the British government actually issued a requirement for a new submachine gun to replace the Stens in service.
The initial Patchett guns worked very well in early 1944 testing, which continued into 1945. It ultimately came out the winner of the trials, but they didn’t conclude until World War Two was over - and nothing was adopted because of the much-reduced need