Arrangements for deploying double agents into occupied territory remained buried in the Security Service files, hiding the cost of moving assets from safehouses to the front lines.
Kept in the Security Service's PF Series files, the record of a Spanish spy in London shows how 'dissolute behaviour' became the excuse for a clumsy extraction.
The men who lied to the Reich thought they were the architects of victory, but a hidden policy file from the Security Service treats them as liabilities to be liquidated during an invasion.
German Intelligence was misled by hidden channels in the UK and elsewhere, a systemic approach to lying that bypassed double agents and whose exact blueprints remain a gap in the record.
German military intelligence was deceived by a pilot who sold his loyalty to every available buyer until complete personal unreliability led to his internment.
Four years of internment followed Edwin Fuller Heath's decision to ignore formal warnings against contact with German intelligence while operating under six different aliases.