Twickenham Film Studios, St. Margaret's, Twickenham
One of the most remarkable scenes in "HELP!" was that in which, heavily disguised, the Beatles are seen at an airport terminal (actually a film set, shot this day), prior to flying out to the Bahamas. It was remarkable because, as the years passed, three of the Beatles assumed his make-believe disguise in real life. With his long flowing beard and granny glasses, John was anticipating his summer-1969 look. Bewhiskered George looked this way again in Spring 1967 (Sgt. Pepper sleeve era) and Ringo's tight-cropped hair and thin beard was his mid-1970 image.
Also shot this day, preceding the imminent visit to Salisbury Plain, the Beatles filmed a scene with Ahme atop a tank turret.
Source: The Complete Beatles Chronicle - Mark Lewisohn