‘In terms of government formation, there are two kinds of parliamentary system: “…countries where the government needs to win an investiture vote are said to have positive parliamentarism, while countries in which the government just needs to be tolerated by parliament are said to have negative parliamentarism”. By this definition, the UK has a negative parliamentary system (excepting s. 2(5), Fixed-Term Parliaments Act 2011): the Queen appoints the Prime Minister by inviting him to form a Government; and subsequent ministers are appointed by the Queen on the advice of the PM; but the House of Commons may move that it has no confidence in HM Government. Compared to a positive parliamentary system – e.g. Spain, where the appointment of the King’s prime ministerial nominee requires a successful vote of confidence by an absolute majority of the Congress of Deputies – a negative one has three disadvantages. These are that there is a democratic deficit in the Government; obscurity in a Government’s democratic mandate, under hung parliaments; and that there are inadequate checks and balances between the Government and Parliament.’
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UK Constitutional Law Association, 11th March 2021
Source: ukconstitutionallaw.org