The Planning (Application to the Houses of Parliament) Order 2006
Part 7 of the Planning and Compulsory Purchase Act 2004 applied the Town and Country Planning Act 1990 to the Crown. Crown land is defined in section 293 of the 1990 Act as land in which there is a Crown interest or Duchy interest. Crown interest is defined as an interest belonging to Her Majesty in right of the Crown or in right of Her private estates, an interest belonging to a government department or held in trust for Her Majesty for the purposes of a government department and such other interest as the Secretary of State specifies by order.