Back in 1943, MI5 successfully managed to deceive Hitler over the Allied re-invasion of Nazi-occupied Europe in World War 2.

Operation Mincemeat involved British intelligence obtaining the body of a dead tramp and dressing him as a Royal Marines officer.

In a move approved by Churchill and Eisenhower, the corpse was released close to the southern coast of Spain, where Spanish fishermen picked it up.

Fictitious correspondence between two British generals on plans for the Allies to invade Greece…