Gadgets used by Mason are part of a display at the Combined Military Services Museum in Maldon, Essex.
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The Combined Military Services Museum in Maldon, Essex houses the only surviving original Cockle Mark II canoe used by the Royal Marine Raiders on Operation Frankton, commonly known as the Cockleshell Heroes.
Under the guidance of Kevan Jones MP, then Under Secretary for Defence it was decided that the Combined Military Services Museum in Maldon, Essex would be the recipient of the collection.
Amongst the items are a series of school exercise books with his notes on training sessions including assessments of trainee agents.Also there is a large amount of information on codes,disguises,explosive tests, interrogation techniques and many other training aids.They are on display at the Combined Military Services Museum in Maldon, Essex .