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Westminster system

Related subjects: Systems of government

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The Houses of Parliament, also known as the Palace of Westminster, in London.

The Westminster system is a democratic, parliamentary system of government modelled after that of the United Kingdom system, as used in the Palace of Westminster, the location of the Parliament of the United Kingdom. The system is a series of procedures for operating a legislature. It is used, or was once used, in the national legislatures and/or sub-national legislatures of most Commonwealth and ex-Commonwealth nations, beginning with the Canadian provinces and Australian Colonies in the mid-19th century when they were colonies. There are other parliamentary systems whose procedures differ considerably from the Westminster system.

Key characteristics

Important features of the Westminster system include the following, although not all of the following aspects have been preserved in every Westminster-derived system:

  • a head of state who is the nominal or theoretical holder of executive power, and holds numerous reserve powers, but whose daily duties mainly consist of performing the role of a ceremonial figurehead. Examples include the British monarch, the presidents of many countries and state/provincial governors in federal systems.
  • a head of government (or head of the executive), known as the prime minister (PM), premier or first minister, who is officially appointed by the head of state. In practice, the head of government is almost always the leader of the largest elected party in parliament.
  • a de facto executive branch usually made up of members of the legislature with the senior members of the executive in a cabinet led by the head of government; such members execute executive authority on behalf of the nominal or theoretical executive authority.
  • parliamentary opposition (a multiparty system);
  • an elected legislature, often bicameral, in which at least one house is elected, although unicameral systems also exist;
  • a lower house of parliament with an ability to dismiss a government by "withholding (or blocking) Supply" (rejecting a budget), passing a motion of no confidence, or defeating a confidence motion. The Westminster system enables a government to be defeated, or forced into a general election, independently of a new government being chosen.
  • a parliament which can be dissolved and elections called at any time.
  • parliamentary privilege, which allows the Legislature to discuss any issue deemed by itself to be relevant, without fear of consequences stemming from defamatory statements or records thereof.
  • minutes of meetings, often known as Hansard, including an ability for the legislature to strike discussion from these minutes.

Most of the procedures of the Westminster system have originated with the conventions, practices and precedents of the Parliament of the United Kingdom, which are a part of what is known as the Constitution of the United Kingdom. Unlike the unwritten British constitution, most countries that use the Westminster system have codified the system in a written constitution.

However, uncodified conventions, practices and precedents continue to play a significant role in most countries, as many constitutions do not specify important elements of procedure: for example, some older constitutions using the Westminster system do not mention the existence of the cabinet and/or the prime minister, because these offices were taken for granted by the authors of these constitutions.


The pattern of executive functions within a Westminster System is quite complex. In essence, the head of state, usually a monarch or president, is a ceremonial figurehead who is the theoretical, nominal or de jure source of executive power within the system. In practice, such a figure does not actively exercise executive powers, even though executive authority may be exercised in his/her name.

The head of government, usually called the prime minister or premier, will ideally have the support of a majority in the responsible house, and must in any case be able to ensure the existence of no absolute majority against the government. If the parliament passes a resolution of no confidence, or refuses to pass an important bill such as the budget, then the government must either resign so that a different government can be appointed or seek a parliamentary dissolution so that new general elections may be held in order to re-confirm or deny the government's mandate.

Executive authority within a Westminster System is essentially exercised by the Cabinet, along with more junior ministers, although the head of government usually has the dominant role within the ministry. In the United Kingdom, the sovereign theoretically holds executive authority, even though the Prime Minister of the United Kingdom and the Cabinet effectively implement executive powers. In a parliamentary republic like India, the President is the de jure executive, even though executive powers are essentially instituted by the Prime Minister of India and the Council of Ministers.

As an exemplar, the Prime Minister and Cabinet (as the de facto executive body in the system) generally must seek the permission of the head of state when carrying out executive functions. If, for instance the British Prime Minister wished to dissolve parliament in order for a general election to take place, the Prime Minister is constitutionally bound to request permission from the sovereign in order to attain such a wish. This power (along with others such as appointing ministers in the government, appointing diplomats, declaring war, and signing treaties, for example) are known as the Royal Prerogative, which in modern times are exerised by the sovereign solely on the advice of the Prime Minister. Since the British sovereign is a constitutional monarch, he or she abides by the advice of his or her ministers, except when executing reserve powers in times of crisis.

This custom also occurs in other Westminster Systems in the world, in consequence from the influence of British colonial rule. In Commonwealth Realms such as Canada, New Zealand or Australia, the Prime Minister is obligated to seek permission from the Governor-General when implementing executive decisions, in a manner similar to the British practice. An analogous scenario also exists in Commonwealth Republics, such as India or Trinidad and Tobago.

The head of state will often hold meetings with the head of government and cabinet, as a means of keeping abreast of governmental policy and as a means of advising, consulting and warning ministers in their actions. Such a practice takes place in the United Kingdom and India. In the UK, the sovereign holds confidential weekly meetings with the Prime Minister to discuss governmental policy and to offer her opinions and advice on issues of the day. In India, the Prime Minister is constitutionally bound to hold regular sessions with the President, in a similar manner to the aforementioned British practice. In essence, the head of state, as the theoretical executive authority, "reigns but does not rule". This phrase means that the head of state's role in government is generally ceremonial and as a result does not directly institute executive powers. The reserve powers of the head of state are sufficient to ensure compliance with some of their wishes. However, the extent of such powers varies from one country to another and is often a matter of controversy.

Such an executive arrangement first emerged in the United Kingdom. Historically, the British sovereign held and directly exercised all executive authority. George I of Great Britain was the first British monarch to delegate some executive powers to a Prime Minister and a cabinet of the ministers, largely because he was also the monarch of Hanover in Germany and did not speak fluent English. Over time, arrangement continued to exercise executive authority on the sovereign's behalf. Such a concept was reinforced in The English Constitution (1876) by Walter Bagehot, who emphasised the "dignified" and "efficient" aspects of government. In this sense Bagehot was stating that the sovereign should be a focal point for the nation, while the PM and cabinet actually undertook executive decisions.

Role of the head of state

The head of state or his/her representative (such as a governor general), formally invites the head of government to form a government (that is, an administration). In the UK, this is known as kissing hands. There are notable exceptions to the above in the Republic of Ireland, where the President of Ireland has a mandate through direct election, and the Taoiseach (prime minister) prior to appointment by the President of Ireland is nominated by the democratically elected lower house, Dáil Éireann.

Because of the mandate and the potentially significant constitutional powers of the Irish president, some authorities believe the Irish constitution is as similar to semi-presidential systems as it is to Westminster. Similarly, under the constitutions of some Commonwealth countries, a president or Governor-General may possess clearly significant reserve powers. One example is the Australian constitutional crisis of 1975, in which the Governor-General dismissed the Prime Minister, who held a majority in the Australian House of Representatives. Because of differences in their written constitutions, the formal powers of presidents and Governors-General vary greatly from one country to another. However, as Governors-Generals are not directly elected, they lack the popular mandate held, for example, by an Irish president. Because of this, Governors-General rarely risk the public disapproval which would result from them making unilateral and/or controversial uses of their powers.

Although the dissolution of the legislature and the call for new elections is formally done by the head of state, by convention the head of state acts according to the wishes of the head of government.

In exceptional circumstances the head of state may either refuse a dissolution request, as in the Canadian King-Byng Affair, or dismiss the government, as in the Australian crisis of 1975. Either action is likely to bend or break existing conventions. The Lascelles Principles were an attempt to create a convention to cover similar situations, but have not been tested in practice.

Cabinet government

In The English Constitution, Bagehot emphasised the divide of the constitution into two components: the Dignified (that part which is symbolic) and the Efficient (the way things actually work and get done) and called the Efficient " Cabinet Government". Although there have been many works since emphasising different aspects of the "Efficient", no one has seriously questioned Bagehot's premise that the divide exists in the Westminster system.

Members of the Cabinet are collectively seen as responsible for government policy. All Cabinet decisions are made by consensus, a vote is never taken in a Cabinet meeting. All ministers, whether senior and in the Cabinet, or junior ministers, must support the policy of the government publicly regardless of any private reservations. When a Cabinet reshuffle is imminent, a lot of time is taken up in the conversations of politicians and in the news media, speculating on who will, or will not, be moved in and out of the Cabinet by the Prime Minister, because the appointment of ministers to the Cabinet and threat of dismissal from the Cabinet, is the single most powerful constitutional power which a Prime Minister has in the political control of the Government in the Westminster system.

Linked to Cabinet government is the idea, at least in theory, that ministers are responsible for the actions of their departments. It is no longer considered to be an issue of resignation if the actions of members of their department, over whom the minister has no direct control, make mistakes or formulate procedures which are not in accordance with agreed policy decisions. One of the major powers of the Prime Minister under the Westminster system is to decide when a fellow minister is accountable for the actions of a department.

The Official Opposition and other major political parties not in the Government, will mirror the governmental organisation with their own Shadow Cabinet made up of Shadow Ministers.

Bicameral and unicameral parliaments

In a Westminster system, some members of parliament are elected by popular vote, while others are appointed. All Westminster-based parliaments have a lower house with powers based on those of the House of Commons (under various names), comprising local, elected representatives of the people. Most also have a smaller upper house, which is made up of members chosen by various methods:

  • De facto appointees of the cabinet or premier (such as the Canadian Senate and some members of the British House of Lords)
  • Direct election (such as the Australian Senate)
  • Election by sub-national governments (such as the Indian Rajya Sabha)
  • Membership determined only by heredity (some members of the House of Lords)

In Britain, the lower house is the de facto legislative body, while the upper house practices restraint in exercising its constitutional powers and serves as a consultative body. In other Westminster countries, however, the upper house can sometimes exercise considerable power.

Some Westminster-derived parliaments are unicameral for two reasons:

  • some, such as the Parliament of New Zealand have abolished their upper houses
  • others have never had them, such as the Parliament of Malta and the Papua New Guinea Parliament.

Australia is exceptional because a prime minister must have an upper house ( Senate of Australia) which is willing to pass budgets. Although government is formed in the lower house ( Australian House of Representatives), the support of the Senate is necessary in order to govern. To cite the prime example of its powers, the Senate maintains an ability similar to that held by the U.S. Senate (or the British House of Lords prior to 1911), to "block supply" (access to government revenue), to the government of the day. A government which is unable to obtain supply can be dismissed by the governor-general - however this is generally used as a last resort and is a highly controversial decision to take, given that the government has a mandate from the electorate to govern. Many political scientists have held that the Australian system of government was consciously devised as a blend or hybrid of the Westminster and the United States systems of government, especially since the Australian Senate is a powerful upper house like the U.S. Senate; this notion is expressed in the nickname "Washminster system". The ability of upper houses to block supply also features in the parliaments of most Australian states.


The Westminster system is often criticised for breeding a variety of political cultures which undermine its effectiveness as a truly democratic and accountable system.

The office of a Westminster prime minister is often criticised for being too powerful. As mentioned above, as he or she effectively determines when "consensus" is reached in cabinet, cabinet members do not have much independence to actively disagree with government policy, even for productive reasons. A cabinet member may be forced to resign simply for opposing one aspect of a government's agenda, even though he agrees with the majority of other proposals. Westminster cabinets also have a tendency to be very large, mostly for partisan reasons. As cabinet is the chief organ of power and influence in the government, members of parliament may resent being mere "back benchers" and thus actively lobby for a position in cabinet once their party is elected to power. The Prime Minister, who is also party leader, will have an active interest in promoting as many members of the party to cabinet as possible, which critics argue undermines the idea of a cabinet driven by meritocracy.

Westminster governments usually do not have a very strong tradition of separation of powers, in practice. Though the head of state, be it governor-general, monarch, or president, will have nominal powers to "check" those of the prime minister, in practice these individuals are usually regarded as little more than figureheads who are not expected to actively intervene in day-to-day politics, often because they lack a popular democratic mandate to do so (governors-general are usually appointed upon the advice of the prime minister, while most Westminster presidents are chosen by parliament). Without an active check on the executive power of the prime minister, it is argued, the PM can in effect rule largely unquestioned. In particular, the ability of a Westminster prime minister to freely appoint a large variety of individuals, such as judges, cabinet ministers, and other senior bureaucrats, has long been a matter of political contention in nations such as India, Canada, and Australia.

The threat posed by non-confidence votes is often used to justify extremely well-disciplined legislative parties in Westminster systems. In order to ensure the government always has the confidence of the majority of the house, the political culture of Westminster nations often makes it highly unusual for a legislator to vote against their party. Critics argue this in turn undermines the freedom and importance of Members of Parliament (MPs) in day-to-day legislating, making cabinet the only organ of government where individual legislators can aspire to influence the decisions of the government. This in turn breeds an obsession with "getting in" cabinet, as mentioned above. Likewise, strong party discipline obviously ensures that no-confidence votes are very rare, though this also eliminates the usefulness of such votes as an active way of holding an incumbent government accountable.

Lastly, legislative committees in Westminster systems tend to be weak, as most senior policy will be made at the cabinet level, regardless of what individual MPs may or may not decide in committee. Their greatest power is often the ability to force a government to reveal certain pieces of information.


The Westminster system has a very distinct appearance when functioning, with many British customs incorporated into day-to-day government function. A Westminster-style parliament is usually a long, rectangular room, with two rows of seats and desks on either side. The chairs are positioned so that the two rows are facing each other. The intended purpose of this arrangement is to create a visual representation of the adversarial nature of parliamentary government. Traditionally, the opposition parties will sit in one row of seats, and the government party will sit in the other. Of course, sometimes a majority government is so large that it must use the "opposition" seats as well. In the lower house at Westminster (the House of Commons) there are lines on the floor in front of the government and opposition benches that members may cross only when exiting the chamber. It is often rumoured that the distance between the lines is that of the length of two swords although no documentary evidence exists to support this and in fact, weapons have never been allowed in the Palace of Westminster at any time.

At one end of the room sits a large chair, for the Speaker of the House. The speaker usually wears a black robe, and in many countries, a wig. Robed parliamentary clerks often sit at narrow tables between the two rows of seats, as well.

Other ceremonies sometimes associated with the Westminster system include an annual Speech from the Throne (or equivalent) in which the Head of State gives a special address (written by the government) to parliament about what kind of policies to expect in the coming year, and lengthy State Opening of Parliament ceremonies that often involve the presentation of a large ceremonial mace.

Current Countries and Territories

The Parliament building in Kuala Lumpur - the Malaysian Parliament is modelled after the Westminster system.
  • Antigua and Barbuda
  • Commonwealth of Australia
  • Bahamas
  • Bangladesh
  • Barbados
  • Belize
  • Bermuda
  • Canada
  • Commonwealth of Dominica
  • Grenada
  • India
  • Republic of Ireland
  • Jamaica
  • Malaysia
  • Malta
  • Mauritius
  • New Zealand
  • Papua New Guinea
  • Singapore
  • Saint Kitts and Nevis
  • Saint Lucia
  • Saint Vincent and the Grenadines
  • Trinidad and Tobago
  • Tuvalu
  • United Kingdom
  • Vanuatu
  • Nauru also adopted a Westminster based system but it is characterized by significant differences.

Former Countries

  • The Union of South Africa between 1910 and 1961, and the Republic of South Africa between 1961 and 1984. The 1983 constitution abolished the Westminster system in South Africa.
  • Rhodesia between 1965 and 1979, and Zimbabwe between 1980 and 1987. The 1987 constitution abolished the Westminster system.
  • Nigeria following the end of British colonial rule in 1960, which resulted in the appointment of a Governor-General and then a President, Nnamdi Azikiwe. The system ended after Nigeria became a republic in 1963.
  • Pakistan following independence in 1947 until 1958 when its old constitution was suspended and new system was adopted.
  • Ceylon between 1948 and 1972, and Sri Lanka from 1972 until 1978 when the constitution was remodelled into a presidential system.
  • Burma following independence in 1948 until the 1962 military coup d'état.
  • Fiji between 1970 and 1987.
  • Guyana between 1966 and 1970. Presidential system established in 1980.
  • The Dominion of Kenya between 1963 and 1964.
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