What are prerogative powers and where do they come from?

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What are prerogative powers used for? How are they used?

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What is the role of the courts in reviewing the existence and exercise of

prerogative powers?

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Is the law on prerogative powers changing/evolving and, if so, how and why?

What are the implications of these changes?

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What does the Brexit litigation tell us about the prerogative, the rule of law, and

parliamentary sovereignty?

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Is legislative reform and/or codification of prerogative powers a good idea?