This showed their friendship spanned much further than suspected.
The Duke of York, who earned praise as a Royal Navy helicopter pilot during the Falklands War, held the rank of Commander by 2001 and was attached to the Diplomatic Directorate of the Naval Staff to the MoD.
This role was primarily aimed at forming relations with foreign naval attaches.
But last night Whitehall sources revealed the alleged spy - known as H6 for legal reasons had access to the MoD's Whitehall HQ on three occasions at the Duke's invitation.
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