1. Display apparatus comprising: a display; an orientation sensitive interface mechanism operable in first and second modes corresponding to respective first and second orientations of said display; selection means for selecting operation of said orientation sensitive interface mechanism in said first or second mode; and orientation sensing means for determining an orientation of said display and operable to automatically activate said selection means in accordance with said orientation, said orientation sensing means comprising a display mode sensor responsive to a display mode control signal indicative of a display mode for an image for display by said display apparatus to automatically activate said selection means in accordance with a sensed display mode.