Wednesbury unreasonableness takes its name from Associated Provincial Picture Houses Ltd v Wednesbury Corporation [1948] 1 KB 223, a case arising from an everyday form of local regulatory power in the UK: the grant of a cinema licence subject to conditions. The local authority permitted a cinema to open on Sundays but attached a condition excluding children under fifteen from admission on that day. The challenge invited the court to treat the condition as an unreasonable interference with the operator’s business and the public’s preferences. Lord Greene MR refused to convert the court into a policy tribunal. He accepted that courts may intervene where a decision is “so unreasonable that no reasonable authority could ever have come to it”, but he emphasised that what matters is not whether the court itself would have decided differently. On questions of public policy, honest and sincere people will differ. In other words, Parliament has placed the primary decision with the administrative authority, and the court’s role is confined to policing the outer boundary of legality.
That factual setting remains instructive for planning and environmental law in Malta because it exhibits, in miniature, the constitutional logic that still animates judicial review in those fields. Planning and environmental decision-making is saturated with evaluative judgments—“fit with context”, “amenity”, “harm”, “acceptable impact”, “mitigation”, “need”, “public interest”—and with predictive assessment. Wednesbury, in its orthodox form, functions as a boundary rule: it prevents courts from becoming the primary arbiters [instead of the Planning Authority and the Environment and Planning Review Tribunal] of contested planning/ environmental merits, while preserving a residual control against decisions that fall outside the minimum discipline of rational legality.
Let us illustrate these concepts with concrete examples.
The Planning Authority may approve a contemporary building in a historic urban area, concluding that it “fits” because height lines are respected, massing is moderated through setbacks, façade rhythms respond to the street, and heritage impacts are mitigated. Many will disagree, sometimes vehemently, but that is precisely because “fit” is an evaluative policy concept that admits more than one defensible view. Provided the authority identifies intelligible planning reasons and demonstrates engagement with the relevant policy considerations, the decision is not irrational merely because another decision-maker might have refused.
Likewise, the ERA may conclude that predicted impacts are acceptable because mitigation measures reduce effects below defined thresholds: restricted hours, noise limits, dust suppression, ecological buffers, monitoring, traffic management, habitat enhancement. Objectors may contest the modelling or argue that thresholds are too permissive, but where the decision-maker identifies the impacts, addresses principal evidence, and explains why mitigation makes residual effects acceptable, the decision remains within lawful evaluative choice. Wednesbury is not a licence for the court to recalibrate environmental risk appetite.
Hence, when is a decision of the Planning Authority deemed unreasonable?
It is when the answer is tainted with non sequiturs: cases where the authority’s operative conclusion does not follow from its own stated premises because the reasoning is internally contradictory or self-defeating. In other words, the ‘reasoning’ is not a dispute about weight or taste, but a failure of logical entailment.
Let us take an example. A development permission is granted for the construction of a 1,000 m² industrial facility, but the permission is expressly time-limited to a single day, without any lawful mechanism that could render compliance possible. The instrument purports to authorise substantial construction while simultaneously making performance impossible. Clearly to anyone in his right senses, the permission negates its own stated purpose.
Or, a permission is granted on the express ground that the proposal satisfies a minimum plot size requirement (for example, at least 1,000 m²), while the authority’s own adopted survey material records the site as 400 m² and the authority does not dispute that measurement. The conclusion depends on a factual predicate that the authority’s own record negates; the reasoning is internally inconsistent.
Similarly, in EIA screening, the ERA concludes that no EIA is required because there will be “no significant effects”, yet the authority’s own adopted screening material identifies significant, unmitigated effects central to the project’s character, with no explanation reconciling the contradiction. Here, one can debate the margins of “significance” – one cannot lawfully assert “no significant effects” while simultaneously adopting reasons that rest on significance.
These planning/environmental examples show why Wednesbury makes sense as a constitutional baseline and why the non sequitur approach is a disciplined way of keeping it honest. Still, most disputes in planning and environmental governance are disputes about evaluative judgment and balance: precisely the kind of disputes Wednesbury instructs courts not to re-make. But where the authority’s conclusion contradicts the premises it itself asserts or adopts, the issue is no longer one of degree or taste. It is the minimum condition of legality: public power must be exercised through reasons that connect to what the authority does.
