“The Man Who Never Was” was a British operation, and not the same as this.
The British also had Ultra (cracking the Enigma code; there was a period of some months when the Germans had added a wheel to the Enigma machines, and the British were unable to crack the messages), and Double Cross (all the German agents in the UK — except for one — were captives and feeding phony info back to Berlin.
There was a US operation in Scotland that was purported to be an entire army (I think purportedly assigned to Patton) that used fake tanks and simulated radio traffic to fool with the Abhwer.
Patton’s deception was the fake First Army Group in S.E. England, to convince the Germans the invasion would be at Pas de Calais. The British ran another deception in Scotland about a fake invasion of Norway. Hitler decided Patton and Pas de Calais was the real deal. One of many, many mistakes Hitler made that helped us win the war.