A missing part of the puzzle concerning the dismissal of the Whitlam government might have been hiding in plain sight for some time -- buried in the memoirs of senior public servant Sir Arthur Tange, permanent head of the Defence Department during the Whitlam years. In Defence Policy-Making: A close-up view (2008), Tange explicitly refers to a meeting in November 1975 between Sir John Kerr and chief Defence scientist John Farrands -- something that those opposed to an "external" interpretation of the Dismissal have always sought to deny.
It's long been argued that the sacking of Whitlam was prompted partly or substantially by his threat to "out" CIA agents working in Australia, and to not renew the lease for US spy base Pine Gap, which fell due on December 10, 1975. Farrands was in charge of the scientific aspects of Pine Gap and knew it better than anyone in Australia. He was both a colleague and friend of Tange's. It has long been supposed that he acted as go-between between Tange and Kerr -- Tange being convinced that Australian defence was on a precipice in November 1975, due to Whitlam's threats.