Legislative functions
Laws can be made by Acts of the United Kingdom Parliament. While Acts can apply to the whole of the United Kingdom including Scotland, due to the continuing separation of Scots law many Acts do not apply to Scotland and may be matched either by equivalent Acts that apply to Scotland alone or, since 1999, by legislation set by the Scottish Parliament relating to devolved matters.
This has led to a paradox known as the West Lothian question. The existence of a devolved Scottish Parliament means that while Westminster MPs from Scotland may vote directly on matters that affect English constituencies, they may not have much power over their laws affecting their own constituency. Since there is no devolved "English Parliament", the converse is not true. Any Act of the Scottish Parliament may be overturned, amended or ignored by Westminster under section 35 of the Scotland Act 1998, and this happened for the first time in January 2023, when the Gender Recognition Reform (Scotland) Bill was prohibited from receiving royal assent. Legislative Consent Motions enables the UK Parliament to vote on issues normally devolved to Scotland, Wales or Northern Ireland, as part of United Kingdom legislation.
Laws, in draft form known as bills, may be introduced by any member of either House. A bill introduced by a Minister is known as a "Government Bill"; one introduced by another member is called a "Private Member's Bill". A different way of categorising bills involves the subject. Most bills, involving the general public, are called "public bills". A bill that seeks to grant special rights to an individual or small group of individuals, or a body such as a local authority, is called a "Private Bill". A Public Bill which affects private rights (in the way a Private Bill would) is called a "Hybrid Bill", although those that draft bills take pains to avoid this.
Private Members' Bills make up the majority of bills, but are far less likely to be passed than government bills. There are three methods for an MP to introduce a Private Member's Bill. The Private Members' Ballot (once per Session) put names into a ballot, and those who win are given time to propose a bill. The Ten Minute Rule is another method, where MPs are granted ten minutes to outline the case for a new piece of legislation. Standing Order 57 is the third method, which allows a bill to be introduced without debate if a day's notice is given to the Table Office. Filibustering is a danger, as an opponent of a bill can waste much of the limited time allotted to it. Private Members' Bills have no chance of success if the current government opposes them, but they are used in moral issues: the bills to decriminalise homosexuality and abortion were Private Members' Bills, for example. Governments can sometimes attempt to use Private Members' Bills to pass things it would rather not be associated with. "Handout bills" are bills which a government hands to MPs who win Private Members' Ballots.
Each Bill goes through several stages in each House. The first stage, called the first reading, is a formality. At the second reading, the general principles of the bill are debated, and the House may vote to reject the bill, by not passing the motion "That the Bill be now read a second time." Defeats of Government Bills in the Commons are extremely rare, the last being in 2005, and may constitute a motion of no confidence. (Defeats of Bills in the Lords never affect confidence and are much more frequent.)
Following the second reading, the bill is sent to a committee. In the House of Lords, the Committee of the Whole House or the Grand Committee are used. Each consists of all members of the House; the latter operates under special procedures, and is used only for uncontroversial bills. In the House of Commons, the bill is usually committed to a Public Bill Committee, consisting of between 16 and 50 members, but the Committee of the Whole House is used for important legislation. Several other types of committees, including Select Committees, may be used, but rarely. A committee considers the bill clause by clause, and reports the bill as amended to the House, where further detailed consideration ("consideration stage" or "report stage") occurs. However, a practice which used to be called the "kangaroo" (Standing Order 32) allows the Speaker to select which amendments are debated. This device is also used under Standing Order 89 by the committee chairman, to restrict debate in committee. The Speaker, who is impartial as between the parties, by convention selects amendments for debate which represent the main divisions of opinion within the House. Other amendments can technically be proposed, but in practice have no chance of success unless the parties in the House are closely divided. If pressed they would normally be casually defeated by acclamation.
Once the House has considered the bill, the third reading follows. In the House of Commons, no further amendments may be made, and the passage of the motion "That the Bill be now read a third time" is passage of the whole bill. In the House of Lords further amendments to the bill may be moved. After the passage of the third reading motion, the House of Lords must vote on the motion "That the Bill do now pass." Following its passage in one House, the bill is sent to the other House. If passed in identical form by both Houses, it may be presented for the Sovereign's Assent. If one House passes amendments that the other will not agree to, and the two Houses cannot resolve their disagreements, the bill will normally fail.
Since the passage of the Parliament Act 1911 the power of the House of Lords to reject bills passed by the House of Commons has been restricted, with further restrictions were placed by the Parliament Act 1949. If the House of Commons passes a public bill in two successive sessions, and the House of Lords rejects it both times, the Commons may direct that the bill be presented to the Sovereign for his or her Assent, disregarding the rejection of the Bill in the House of Lords. In each case, the bill must be passed by the House of Commons at least one calendar month before the end of the session. The provision does not apply to Private bills or to Public bills if they originated in the House of Lords or if they seek to extend the duration of a Parliament beyond five years. A special procedure applies in relation to bills classified by the Speaker of the House of Commons as "Money Bills". A Money Bill concerns solely national taxation or public funds; the Speaker's certificate is deemed conclusive under all circumstances. If the House of Lords fails to pass a Money Bill within one month of its passage in the House of Commons, the Lower House may direct that the Bill be submitted for the Sovereign's Assent immediately.
Even before the passage of the Parliament Acts, the Commons possessed pre-eminence in cases of financial matters. By ancient custom, the House of Lords may not introduce a bill relating to taxation or Supply, nor amend a bill so as to insert a provision relating to taxation or Supply, nor amend a Supply Bill in any way. The House of Commons is free to waive this privilege, and sometimes does so to allow the House of Lords to pass amendments with financial implications. The House of Lords remains free to reject bills relating to Supply and taxation, but may be over-ruled easily if the bills are Money Bills. (A bill relating to revenue and Supply may not be a Money Bill if, for example, it includes subjects other than national taxation and public funds).
The last stage of a bill involves the granting of royal assent. Theoretically, the Sovereign may either grant or withhold royal assent (make the bill a law or veto the bill). In modern times the Sovereign always grants royal assent, using the Norman French words "Le Roy le veult" (the King wishes it; "La Reyne" in the case of a Queen). The last refusal to grant the Assent was in 1708, when Queen Anne withheld her Assent from a bill "for the settling of Militia in Scotland", in the words "La reyne s'avisera" (the Queen will think it over).
Thus, every bill obtains the assent of all three components of Parliament before it becomes law (except where the House of Lords is over-ridden under the Parliament Acts 1911 and 1949). The words
"BE IT ENACTED by the King's most Excellent Majesty, by and with the advice and consent of the Lords Spiritual and Temporal, and Commons, in this present Parliament assembled, and by the authority of the same, as follows:-," or, where the House of Lords' authority has been over-ridden by use of the Parliament Acts, the words "BE IT ENACTED by King's most Excellent Majesty, by and with the advice and consent of the Commons in this present Parliament assembled, in accordance with the provisions of the Parliament Acts 1911 and 1949, and by the authority of the same, as follows:-" appear near the beginning of each Act of Parliament. These words are known as the enacting formula.