However, in summary the core grounds are based on assessing whether:
the decision maker was acting unlawfully, i.e. outside the powers granted to it;
the decision was made using an unfair procedure; or
the decision was so unreasonable as to be irrational, often referred to as "Wednesbury unreasonableness" in reference to a landmark case.iAssociated Provincial Picture Houses Ltd. v Wednesbury Corporation [1948] 1 KB 223
There are also situations where the courts will carry out a more intense review of public bodies' decisions, for example when fundamental rights are at stake1Craig, P. (2015, April 18).