Mincemeat was carefully designed to fit within the existing deception architecture. The false targets it pointed to — Greece and Sardinia — were the same targets that the broader Barclay deception was promoting. The timing was designed to be consistent with the military preparations that were visible to German observers. The level of classification of the documents Martin was supposedly carrying was calibrated to the level of access that a real officer of his rank and role would plausibly have.
M. RECOGNITION DELAYED: THE FIFTY-YEAR WAIT
The restoration of Glyndwr Michael’s name to history was a slow process, hampered for decades by the classification of the relevant documents and by the deliberate omissions in Montagu’s public account.
Montagu’s 1953 book, The Man Who Never Was, was careful to describe “the man” only in terms of his physical characteristics and his role as a body. The actual identity was not disclosed because the relevant documents were still classified. Montagu’s account used a pseudonym — something like “a Welsh laborer” without specific naming — that preserved enough anonymity for the government’s classification requirements while giving readers a sense of the real man’s background.
The declassification of British wartime intelligence records was a long process. The fifty-year rule that applied to many British government documents would have made the relevant records available in the 1990s, but specific intelligence files often remained classified beyond the standard period. The identity of the real man behind William Martin was not formally confirmed by the British government until 1998.
The breakthrough came from the work of amateur historian Roger Morgan. Working in what was then the Public Record Office (now the National Archives) in the mid-1990s, Morgan found documentary evidence that identified Glyndwr Michael as the body used in Operation Mincemeat. He published his findings, creating a public record of the identification for the first time.