"Most films disguise it as something else, like Victorian London, but the film - because it is to do with time and the meridian - is filmed in Greenwich." Mr Allchin, who has overseen movies made at the World Heritage site for six years, says his team works to protect the grounds - such as precautions taken when 13 tonnes of rubble was dumped on Grand Square in Thor.
Films including Sherlock Holmes and Sherlock Holmes: A Game of Shadows, Four Weddings and a Funeral, Skyfall, Les Miserables, The Iron Lady, The Golden Compass and Gulliver’s Travels were all made in Greenwich on his watch.
With challenges including rebuilding false pine wood parts of The Painted Hall for Jack Sparrow to crash through on a chandelier during Pirates of the Caribbean: On Stranger Tides or horses charging up and down on the grounds in Les Mis’ fighting scenes.
He recalled anecdotes such as when a funeral scene for Skyfall brought crowds of sombre passersby who watched quietly as they believed it to be a real service.
Mr Allchin added: "During that filming, Trinity College of Music were right opposite and the brass section kept playing the James Bond theme - until the director went round." The world-hopping escapades of stars Natalie Portman and Chris Hemsworth in Marvel’s Thor: The Dark World are coming to UK cinemas from October 30.