During 2005 to 2006, The National Archives undertook an investigation in response to allegations that certain documents cited in three books by Martin Allen and held in The National Archives were forgeries. The investigation, in conjunction with the Metropolitan Police and forensic services, identified 29 forged documents in total.
The three works citing the forgeries are:
Hidden Agenda: How the Duke of Windsor Betrayed the Allies (London, Macmillan, 2000).
The Hitler / Hess Deception: British Intelligence's Best Kept Secret of the Second World War (HarperCollins, London, 2003).
Himmler's Secret War: the Covert Peace Negotiations of Heinrich Himmler (Robson Books, London, 2005).
The investigation was catalysed by correspondence received by the National Archives in October 2004 from an eminent Second World War historian that cast doubts on the authenticity of these documents. A limited examination was made but no firm conclusions were drawn from it at the time.
In June 2005, Mr Ben Fenton, a journalist with the Daily Telegraph, wrote to The National Archives also questioning the authenticity of some of the documents cited in the book 'Himmler's Secret War'. This newspaper requested that the five documents be forensically tested at a private laboratory at its own cost, which The National Archives agreed to allow under its supervision. The results indicated that all five documents were forgeries.
A further investigation identified an extra 24 National Archives referenced documents cited in Martin Allen's books. These documents were forensically tested in government laboratories and also found to be forged documents.
The Metropolitan Police investigation evidence was referred to the Crown Prosecution Service who decided in 2006 not to pursue a conviction in the courts.
The forged documents were extracted from the files in which they were found during the investigation in 2007 and have been placed in this record series.