The jurisdiction of the superior courts to review the acts, decisions, and omissions of public authorities in order to establish whether they have exceeded or abused their powers
Judicial review is the means of ensuring that public bodies act within the limits of their legal powers and in accordance with the legal principles governing the exercise of their decision-making functions
Courts have developed new and developing grounds for judicial review such as legitimate expectations, proportionality, consultation, and breach of Human Rights Act 1998
There is a struggle for power between governmental institutions, with the government potentially seeking to pass emergency legislation to undermine the effect of judicial review decisions
Nemo judux in causa sua - let no man be a judge in his own cause
Bias/or appearance of bias (actual bias, rarely arises & is difficult to prove)
Automatic disqualification (for pecuniary or proprietary interest)
Apparent bias: 'The question is whether the fair-minded and informed observer, having considered the facts, would conclude that there was a real possibility that the tribunal was biased'
Prevents public authority from implementing impugned decision or an inferior court or tribunal from carrying out an act which is beyond its jurisdiction