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Most delegated legislation in Great Britain is made in the form of a Statutory Instrument. (In Northern Ireland, delegated legislation is organised into Statutory Rules, rather than Statutory Instruments.) The advent of devolution in 1999 resulted in many powers to make Statutory Instruments being transferred to the Scottish Government and Welsh Assembly Government, and oversight to the Scottish Parliament and National Assembly for Wales. Instruments made by the Scottish Government are now classed separately as Scottish Statutory Instruments.
A Statutory Instrument is used when an Act of Parliament passed after 1947 confers a power to make, confirm or approve delegated legislation on:
'Minister of the Crown' includes the Welsh Ministers and various Acts provide that delegated legislation, although made by another person (for example, the General Dental Council), is also to be made by Statutory Instrument.
Use of a Statutory Instrument is not required where the parent Act does not specify it. This may be the case where delegated legislation is of only limited application and therefore not of general importance. Instead, other provisions may be made for publishing the legislation. So, for example, an Order providing for the transfer of contracts from one National Health Service body to another may only be notified to the affected bodies, and by-laws made by a local council may be publicised through an announcement in local newspapers.
The main effect of delegated legislation being made by Statutory Instrument is that as soon as it is made it is numbered, catalogued, printed, made available for sale and published on the internet. This ensures that the public has easy access to the new laws.
Numbers are assigned by Her Majesty's Stationery Office and are sequential within the year of making. The number provides a means of citing the Statutory Instrument in addition to the title given by the Instrument itself. So, for example, The Income Tax (Exemption of Minor Benefits) (Amendment) Regulations 2003 are numbered and may be cited as SI 2003 No. 1434 or SI 2003/1434.
In addition to the main numbering system, there are a number of subsidiary numbering systems which may indicate an Instrument's position within a particular series of Instruments (in the following list n indicates the number):
Statutory Instruments will be classified by subject heading in the annual edition printed by Her Majesty's Stationery Office.
Printed copies of a Statutory Instrument will generally be on sale within a week of the date it is made.
Most Statutory Instruments (SIs) are subject to one of two forms of control by Parliament, depending on what is specified in the parent Act.
It should be noted that Parliament's control is limited to approving, or rejecting, the Instrument as laid before it: it cannot (except in very rare cases) amend or change it.
The more common form of control is the ‘negative resolution procedure’. This requires that either:
A motion to annul a Statutory Instrument is known as a 'prayer' and uses the following wording:
Any member of either House can put down a motion that an Instrument should be annulled, although in the Common unless the motion is signed by a large number of Members, or is moved by the official Opposition, it is unlikely to be debated, and in the Lords they are seldom actually voted upon.
If a resolution to annul an Instrument is passed, it will be revoked by the Queen through an Order-in-Council. Between the date of the resolution to annul and the date when the Order-in-Council is made, the Instrument remains law but ineffective. Anything done under the Instrument whilst it was in force remains valid, and the Government is free to make a new Statutory Instrument.
The last occasion on which a Statutory Instrument was annulled was when, on 22 February 2000, the House of Lords passed a motion to annul the Greater London Authority Elections Rules 2000 (SI 2000/208). The last time the House of Commons annulled a Statutory Instrument was in 1979 when it rejected the Paraffin (Maximum Retail Prices) (Revocation) Order 1979 (SI 1979/797). 
Statutory Instruments which are subject to affirmative resolution are less common, making up about 10% of the total. This is the more stringent form of parliamentary control as it requires positive approval, rather than the absence of a decision to annul. Accordingly, it is used where the delegated legislation may be more controversial.
The parent Act may require that the proposed Statutory Instrument is approved by both Houses of Parliament (or, in the case of an Instrument which relates to financial matters, by the House of Commons only) either:
Once the Instrument is laid before Parliament, the Government will move a motion in each House that the Instrument is approved.
The last time a draft Statutory Instrument subject to affirmative procedure was not approved by the House of Commons was on 12 November 1969 when the House rejected four draft Orders relating to parliamentary constituencies.
The Regulatory Reform Act 2001 enables the Government to make an Order to change Acts of Parliament so as to remove burdens on business or others, so long as it can be done without removing ‘necessary protections’. Because of the extensive powers given to the Government to amend primary legislation, a special, extra-rigorous, form of affirmative procedure has been introduced.
Firstly, the Government must produce a draft proposal and consult interested organisations. It must then lay the proposal and the results of the consultation, along with a detailed explanation, before Parliament for 60 days. Select Committees of both Houses then debate the proposal and examine it against criteria including maintenance of "necessary protection" for those who may be affected, the adequacy of public consultation, the extent of the burden to be lifted, financial implications and compliance with European law. The Committees then report their findings to the House. The Government has to take those findings into account when deciding whether to proceed with the proposal. If it does, it then lays a draft Order before Parliament along with an explanation of any changes made, which is again considered by the Committees before finally being put to a vote of each House for approval.
Examples of the use of Regulatory Reform Orders have included The Regulatory Reform (Sunday Trading) Order 2004 (SI 2004/470) which repealed section 26 of the Revenue Act 1889 (and so re-legalised the selling of methylated spirits on a Saturday night or a Sunday), and The Regulatory Reform (Trading Stamps) Order 2005 (SI 2005/871) which repealed the entirety of the Trading Stamps Act 1964.
The Human Rights Act 1998 created a procedure under which, if the courts find that an Act of Parliament contravenes the European Convention on Human Rights, the Government can make a Remedial Order to correct the Act in question.
Before making a Remedial Order, the Government must lay a proposal before Parliament for 60 days, during which time it will be considered and reported upon by the Joint Committee of both Houses on Human Rights. After the 60 days have passed, the Government may then lay a draft Order before Parliament, following which there is another 60 day period in which the Joint Committee will make a recommendation to both Houses whether the Order should be approved.
An emergency procedure allows for Remedial Orders to be made immediately and debated afterwards; they must be approved within 120 days or will cease to have effect.
Some statutory instruments are made under provisions of Acts which allow the instrument to change the parent Act itself, or to change other primary legislation. These provisions, allowing primary legislation to be amended by secondary legislation, are known as Henry VIII clauses, because an early example of such a power was conferred on King Henry VIII by the Statute of Proclamations 1539. The Delegated Powers and Regulatory Reform Select Committee of the House of Lords issued a report concerning the use and drafting of such clauses,  an issue its chairman remarked "goes right to the heart of the key constitutional question of the limits of executive power".  Such clauses have often proved highly controversial — for instance, that in the Nationality, Immigration & Asylum Act 2002 which prompted the aforementioned report, and more recently the Legislative and Regulatory Reform Act 2006.
There are three Committees which have a general supervisory role in relation to Statutory Instruments.
The Joint Committee on Statutory Instruments (a Committee of both Houses of Parliament) checks that an Instrument is being made in accordance with the powers granted to the Minister making it. It does not consider the policy of Instruments, but is concerned only with technical matters. The Joint Committee may draw the attention of both Houses to an Instrument if it:
Where an Instrument is required to be laid before the House of Commons only, then the Commons' Select Committee on Statutory Instruments undertakes a similar examination.
The House of Lords Committee on the Merits of Statutory Instruments considers the policy of Statutory Instruments and would draw the attention of the House of Lords to a Statutory Instrument if it:
In addition, the House of Commons may refer a Statutory Instrument to a Standing Committee for detailed debate on the merits of the legislation if a motion to annul (in the case of an Instrument subject to negative resolution) or approve (in the case of an Instrument subject to affirmative resolution) is made. The Committee will report its conclusions to the House which will then vote on the motion to annul or approve (as the case may be).
Most Acts of Parliament stipulate that their provisions shall not come into force until a date to be fixed by one or more Commencement Order made by the Government, thereby giving the authorities time to make necessary preparations. Commencement Orders are laid before Parliament but are not subject to either the affirmative or negative procedure.
Many Statutory Instruments (indeed, the largest group after those subject to the negative resolution procedure) are not required to be laid before Parliament at all, and are therefore not subject to any Parliamentary control.
As with all delegated legislation, because Statutory Instruments are made by a person exercising a power conferred by an Act of Parliament for a specified purpose, rather than by Parliament exercising its sovereign law-making powers, they can be struck down by the courts if it is concluded that they are ultra vires (literally, outside the powers conferred by the parent Act). This would be the case if the Government attempts to use delegated legislation for a purpose not envision by the parent Act, or if the legislation is an unreasonable use of the power conferred by the Act, or if pre-conditions imposed by the Act (for example, consultation with certain organisations) have not been satisfied.