Princess's Stewardess -- Shown at work in her airborne galley is Stewardess Jean Gordon, 30, of Beaconsfield, Buckinghamshire, who will be one of the crew of 11 of the British Overseas Airways Stratocruiser in which Princess Elizabeth and the Duke of Edinburgh will fly form London Airport on October 7 to begin their Canadian tour - delayed owing to the illness of the King. Miss Gordon is one of B.O.A.C.'s most experienced stewardesses with the reputed ability to 'soothe the most nervous passenger