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Challenging the balance of power (Pt 2)

14 March 2019 / Simon Parsons
Issue: 7832 / Categories: Features , Procedure & practice , Judicial review
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In his second update, Simon Parsons examines the possible grounds to challenge the public law decisions taken by public bodies

  • Grounds of judicial review: illegality, irrationality, procedural impropriety.

See 'Challenging the balance of power (Pt 1)here

Decisions of public bodies are liable to challenge by way of judicial review and may be quashed as ultra vires (beyond the powers) by reference to the ordinary principles of English public law. The jurisdiction of the court is supervisory and not appellate thus judicial review looks at legality, not merits (the quality of the decision) it cannot (supposedly) provide the applicant with a substitute decision as the decision is for government.

Substantive hearing stage

In Council of Civil Service Unions v Minister for the Civil Service [1985] A C 374 HL (the GCHQ case) Lord Diplock identified (at 410-411) three grounds of judicial review as: 

  • Illegality -where a public body abuses its power. (Substantive ultra vires).
  • Irrationality -unreasonableness- a decision that defies logic- a decision
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