Here is Niven at his best. He and Errol Flynn were filming The Charge of the Light Brigade for a director, Michael Curtiz, ''whose Hungarian-orientated English was a joy to us all''. High on the rostrum he decided the moment had come to order the arrival on the scene of a hundred riderless chargers. "Okay," he yelled into a megaphone, "Bring on the empty horses!" ''BRING ON THE EMPTY HORSES is the second part of David Niven''s internationally bestselling autobiography, following the superbly entertaining THE MOON''S A BALLOON. Both books were highly acclaimed by the critics and remain as wonderful reminders of a much-loved actor who epitomised, for many, the essential British gent, even when surrounded by the stars of Hollywood.