“The discretion to stay is not a disciplinary jurisdiction and ought not to be exercised in order to express the court’s disapproval of official conduct .... ‘pour encourager les autres’ ”
“The validity of an Enforcement Notice shall not, except by way of an appeal under Part 7, be questioned in any proceedings whatsoever on any of the grounds on which such an appeal may be brought.”
“But, my Lords, while I am willing for the sake of argument to accept Mr. Speaight’s submission that there is a wide right for anyone prosecuted under a local byelaw to challenge its validity, the point at which we absolutely part company is when he submits that this right can be extrapolated to enable a defendant to challenge the vires of every act done under statutory authority if its validity forms part of the prosecution's case or its invalidity would constitute a defence. In my view, no such generalisation is possible. The question must depend entirely upon the construction of the statute under which the prosecution is brought. The statute may require the prosecution to prove that the act in question is not open to challenge on any ground available in public law, or it may be a defence to show that it is. In such a case, the justices will have to rule upon the validity of the act. On the other hand, the statute may upon its true construction merely require an act which appears formally valid and has not been quashed by judicial review. In such a case, nothing but the formal validity of the act will be relevant to an issue before the justices. It is in my view impossible to construct a general theory of the ultra vires defence which applies to every statutory power, whatever the terms and policy of the statute.”
“(1) Is a defendant, who is prosecuted for an offence contrary tosection 179(1) of the Town and Country Planning Act 1990 , entitled as a matter of right to put forward in such proceedings the defence that the Enforcement Notice relied upon by the prosecution is invalid on the grounds that the decision to issue it was ultra vires? (2) If a defendant is not permitted to raise such a defence as of right in criminal proceedings and can only challenge the validity of such notice on such grounds in proceedings for judicial review, are there any exceptions to such a rule, such as where it is contended by the defendant that the invalidity arises as a result of mala fides on the part of the authority issuing the Enforcement Notice?”
“I am unable to accept that it can be right for the local authority to rely on its own unlawful act (the grant of an invalid site licence) to found the prosecution.”