In order to reduce pressure on parliamentary time, Acts of Parliament often give government ministers or other authorities the power to regulate administrative details by means of 'delegated' or secondary legislation. However since delegated legislation in many instances is made by non-elected bodies which results from transferring law-making powers from the legislature to the executive it is therefore delegated powers must be subject to effective checks and controls to ensure accountability and prevent misuse, and this control is exercised by Parliament and by courts.
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