Briefcase abroad. . . Your Helicopter Is Waiting Sir. - There's no struggling through traffic jams to office and back for Mr. Dick Fairey, 39-year-old general manager of the Fairey Aviation Company.As he sips his last cup of breakfast coffee each morning, Mr. Fairey's butler Godfrey announces: "Your helicopter is waiting, sir."And Mr. Fairey - who lost both legs by frostbite in wartime after spending six days in a lefeboat - walks out into the back garden of his home at Pinkneys Green, near Maidenhead, and climbs into the "driver's seat" of his machine. His briefcase is handed to him.And off he whirls over his house. You can see the shadow of his helicopter on his lawn in yesterday morning's sunshine.A motorlist leaving at the same time would take 50 minutes to get to his office at Hayes, Middlesex. Yesterday, Mr. Fairey was there in eight minutes. April 26, 1955.