List of British deception formations in World War II
During the Second World War, the British Army made extensive use of fictional formations as part of various military deception efforts to inflate their order of battle. The use of such formations was pioneered by Lieutenant-Colonel Dudley Clarke, based within the Mediterranean and Middle East theatre, and later joined by colleagues located in the UK. The initial efforts were small and created a fictional brigade with no long-term goal.
Source: Wikipedia — List of British deception formations in World War II (CC BY-SA 4.0)