Constitutional and administrative - "Under the largely unwritten constitution of the United Kingdom, the separation of powers is difficult to ascertain and evaluate".

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Constitutional and administrative essay

“Under the largely unwritten constitution of the United Kingdom, the separation of powers is difficult to ascertain and evaluate”

This statement needs an explanation of the doctrine of the separation of powers and an analysis of the rule of law required. The statement assumes that the British Constitution is based upon the doctrine of separation of powers, and whilst this may well be true it is an assumption that needs to be considered.

Is the doctrine of the separation of powers irrelevant in the British Constitution? The doctrine, mainly developed by Montesquieu and his followers, is based on the principle that the powers of the legislature, judiciary and the executives should be in different hands, so as to provide for a system of checks and balances between each branch of government. The doctrine of the separation of powers as explained by the French jurist Montesquieu has it that ‘All would be lost if… the same body…exercised these three powers, that of making laws, that of executing public decisions, and that of judging the crimes or the disputes of private persons’ Under the constitution of the United States for example, the legislature, in the form of Congress, can veto the Presidents nominations for Supreme Court appointments. Similarly, the Supreme Court can invalidate legislation enacted by Congress, on the grounds that it is unconstitutional.

However if one examines the British Constitution it is undoubtedly the case that one will find many examples of the doctrine being violated. Ministers, members of the executives, are allowed to sit as members of the legislative body, the House of Commons. Judges have a role in creating law, by virtue of their powers to ‘discover’ (or develop the common law), declaring the common law clearly means creating it, as the common law often has to meet fresh situations which have not previously been addressed. A clear example of which is provided by Shaw v DPP (1962) where a common law offence of corrupting public morals was invented by the judges. Arguably this involves the judiciary in usurping, or at least duplicating the functions of the legislature.

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However to suggest that the doctrine of separation of powers is thus of ‘no application’ to the British Constitution, could be submitted as being rather exaggerated. Lord Donaldson here repeats the familiar judicial learning on the doctrine of separation of powers; as Lord Diplock said in an earlier case, ‘ the British Constitution, though largely unwritten, is firmly based on the separation of powers: Duport Steels v Sirs (1980). Also one of the main purposes of the House of Commons Disqualification Act 1975 was to simplify the law relating to the involvement of members of the executives in the ...

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