headings and in complex delegated legislation, the document may be divided into parts. The main text is followed by any schedules and explanatory notes. Controls Delegated legislation is controlled by parliament and the judiciary. Parliamentary controls include "affirmative resolution procedures" where the legislation requires approval in both houses of parliament and "negative resolution procedures" where the legislation may be vetoed by either house. By convention, the House of Lords will not veto but rather pass a motion to convey its concerns about the legislation. Judicial control of delegated legislation is exercised through judicial review. Delegated legislation can be quashed by a court if it is found to be ultra vires (outside the parameters defined in the parent Act). There are two types of ultra vires. In "substantive ultra vires", delegated legislation is deemed void because it goes beyond the powers defined in the parent Act. In "procedural ultra vires", delegated legislation is deemed void because of some procedural deficiency. A court may also quash delegated legislation on the basis of unreasonableness. See also Statutory Instrument Practice, 3rd edition (June 2003), Cabinet Office and His Majesty's Stationery Office House of Commons Information Office Factsheet L7 - Statutory Instruments References Laws in the United Kingdom United Kingdom administrative law