Given the question: Generate a question about the following movie plot: In 1968 the East-West agreement is established to halt nuclear proliferation. One of the clauses, the Fourth Protocol, forbids the non-conventional delivery of a nuclear weapon to a target. MI5 officer John Preston (Michael Caine) breaks into the residence of British government official George Berenson (Anton Rodgers) on New Year's Eve and finds a number of top secret NATO files that should not have been there. He reports his findings to high-ranking British Secret Service official Sir Nigel Irvine (Ian Richardson), who deals with the leak. Preston's unauthorised method of retrieving the documents embarrasses the acting-Director of MI5, Brian Harcourt-Smith (Julian Glover), and as punishment for his insubordination, Preston is relegated to lowly "Airports and Ports". KGB officer Major Valeri Petrofsky (Pierce Brosnan) is sent on a mission to the United Kingdom by General Govorshin (Alan North), the head of the KGB. Govershin's subordinate, Borisov (Ned Beatty), complains to his old friend General Karpov (Ray McAnally), about his espionage department being stripped of resources and personnel, particularly his star officer Petrofsky. A surprised Karpov quietly investigates and learns about Petrofsky's unsanctioned mission to violate the Fourth Protocol by assembling and detonating an atomic device so that it will appear to be a nuclear accident at a nearby military base. It is intended to strain British-US relations and strengthen the anti-nuclear movement in advance of an election in favour of the Soviet Union. In Glasgow, a Soviet sailor is struck by a truck while fleeing from a port guard. Among the dead man's possessions, Preston finds a disk of polonium, which could only be useful as a component of a detonator for a bomb. He informs Harcourt-Smith, but is promptly suspended, as Harcourt-Smith believes that Preston is manufacturing a fake incident to work his way back into MI5. Luckily Preston has the confidence of Sir Bernard Hemmings (Michael Gough), the gravely-ill Director of MI5, as well as Irvine,...
The answer is:
Who is the acting-Director of M15?