Godfrey's own account of the NID grading scheme survives only as un-digitized archival material at the Caird Library and Churchill Archives Centre

intelligence-tradecraftadmiralty-codegodfreyhistoriographyarchival-recordunverified

The vault's existing narrative of the Admiralty Code's 1939 origin rests entirely on Ludo Block's 2021 secondhand retelling of Donald McLachlan's 1968 institutional history — never on anything in Godfrey's own hand. That material does exist and is identifiable by catalogue number: the National Maritime Museum's Caird Library holds "Typewritten notes and reminiscences relating to Godfrey's work in N.I.D.'s 'Room 39'" (GOD/93), a complete set of his unpublished "Naval Memoirs" in eight-plus volumes (GOD/165–176), "Shreds and Trimmings. Part 2" — short articles, anecdotes, and letters Godfrey collected on the N.I.D. (GOD/164) — and, most directly relevant, "Typewritten copies of correspondence between Godfrey and Donald Mclachlan relating to the writing of Mclachlan's book about N.I.D." (GOD/97). None of this is digitized or reachable by any tool used this session; the catalogue record itself confirms these are physical manuscripts requiring an in-person visit. A separate set of memoir volumes was also given by Godfrey to Churchill College, Cambridge in 1966–67 (per Wikipedia, citing the Churchill Archives Centre finding aid), whose own catalogue page returned HTTP 403 and could not be consulted.

Because Godfrey's own account is real, catalogued, and specifically inaccessible — not merely silent or absent — whether his own words explain any resemblance between the Admiralty Code and Quellenkritik is [unverified-primary — needs direct read of GOD/93, GOD/97, GOD/165–176, or the Churchill Archives memoir set]. See question-verify-godfrey-nid-origin-against-mclachlan-room-39, which this finding narrows without closing.