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It will be broadcast from the BBC's Elstree studios on Friday, 19 February at 2000 GMT.
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The exhibition - at the Elstree Film and Television Studios - is open until 1 September.
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The gun was in the care of Elstree Props, a firm which is based at the studios.
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Although the facilities are in Borehamwood, just north of London, they are named after the neighbouring town of Elstree.
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Creepy indoor scenes, including endless hallways, along with the hedge maze scene, were sets created in the United Kingdom at Elstree Studios.
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Ironically I worked out of Elstree Film Studios in the late nineties and met a few who worked on the original film.
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The gun was noticed to be missing from Elstree Studios on Friday.
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Mr Barnes, 50, was flying from Redhill Aerodrome in Surrey to Elstree when the helicopter clipped the crane and crashed into Wandsworth Road.
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The helicopter, which was on a flight from Redhill to Elstree, was waiting to land at Battersea heliport where it had been diverted due to poor weather.
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Back in 1975 Elstree Film Studios was struggling and got to make the original Star Wars movie because Lucas was a new boy, on a tight budget.
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Longer trains will be able to call at Radlett, Elstree and Borehamwood, Mill Hill Broadway and West Hampstead from 2018 when the final Thameslink Programme timetable is introduced.
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Props from the Indiana Jones films - made at the nearby Elstree Film and Television Studios - also feature, including the revolver used by Harrison Ford in the famous Raiders of The Lost Ark duel scene.
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