The executive must comply with the requirements of Acts of Parliament passed by the legislature; in choosing to ignore them, the executive is deciding which laws should and should not have effect, thereby usurping the role of the legislature.
The judiciary must respect the proper limits of its role. Political matters should not constitute the diet of judges. When disputes arise between the executive and legislature in political matters, the judiciary should be slow to interfere.
The legislature must be able to enact legislation and hold government to account. The executive cannot bring into force limitations which would limit the ability of the legislature to make or unmake law. The judiciary has an obligation to intervene in such matters.
The idea of a separation of powers in the UK is a fallacious and unhelpful one; real importance lies with ensuring power is evenly and fairly spread across institutions.
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