The powers in Chapters 6 and 7 are exercisable in relation to premises which are on land in which there is a Crown interest or a Duchy interest.
A "Crown interest" means—
an interest belonging to His Majesty in right of the Crown, or
an interest belonging to a government department or held in trust for His Majesty for the purposes of a government department.
A "Duchy interest" means an interest belonging to His Majesty in right of the Duchy of Lancaster or belonging to the Duchy of Cornwall.