BBC political and royal events commentator 'Andrew Marr' examines the life and role of the present British monarch at the occasion of the diamond jubilee, 60 years after her father's death put her on the throne of most Commonwealth nations. He examines how monarchy is a matter of (at least apparent) tradition and (preferably smooth, often unnoticed) change, to balance a heritage since the feudal age and the demands of the modern media age.