R v Secretary of State for the Environment, Transport and the Regions, ex parte Spath Holme Ltd  1 All ER 195
LORD BINGHAM:.... In Pepper v. Hart the House (Lord Mackay of Clashfern L.C. dissenting) relaxed the general rule which had been understood to preclude reference in the courts of this country to statements made in Parliament for the purpose of construing a statutory provision. In his leading speech, with which all in the majority concurred, Lord Browne-Wilkinson made plain that such reference was permissible only where (a) legislation was ambiguous or obscure, or led to an absurdity; (b) the material relied on consisted of one or more statements by a minister or other promoter of the Bill together, if necessary, with such other parliamentary material as might be necessary to understand such statements and their effect; and (c) the effect of such statements was clear. In my opinion, each of these conditions is critical to the majority decision:
(1) Unless the first of the conditions is strictly insisted upon, the real risk exists, feared by Lord Mackay, that the legal advisers to parties engaged in disputes on statutory construction will be required to comb through Hansard in practically every case. This would clearly defeat the intention of Lord Bridge of Harwich that such cases should be rare, and the submission of counsel that such cases should be exceptional.
(2) It is one thing to rely on a statement by a responsible minister or promoter as to the meaning or effect of a provision in a bill thereafter accepted without amendment. It is quite another to rely on a statement made by anyone else, or even by a minister or promoter in the course of what may be lengthy and contentious parliamentary exchanges, particularly if the measure undergoes substantial amendment in the course of its passage through Parliament.
(3) Unless parliamentary statements are indeed clear and unequivocal (or, as Lord Reid put it in Reg. v. Warner  2 AC 256 at 279E, such as "would almost certainly settle the matter immediately one way or the other"), the court is likely to be drawn into comparing one statement with another, appraising the meaning and effect of what was said and considering what was left unsaid and why. In the course of such an exercise the court would come uncomfortably close to questioning the proceedings in Parliament contrary to article 9 of the Bill of Rights 1689 and might even violate that important constitutional prohibition.
It has been argued that the stringent conditions laid down by the House in Pepper v. Hart were not satisfied in that very case; see Bennionon Statutory Interpretation (3rd ed., 1997) at pp. 483-485. That is not a view I could accept; there was a difference of judicial opinion when the matter was first argued in the House and there were very clear statements on the point at issue by the responsible minister. But the case turned on a narrow point, the meaning of "the cost of a benefit" in s.63(2) of the Finance Act 1976. The minister gave what was no doubt taken to be a reliable statement on the meaning of that expression. Here the issue turns not on the meaning of a statutory expression but on the scope of a statutory power. In this context a minister might describe the circumstances in which the government contemplated use of a power, and might be pressed about exercise of the power in other situations which might arise. No doubt the minister would seek to give helpful answers. But it is most unlikely that he would seek to define the legal effect of the draftsman's language, or to predict all the circumstances in which the power might be used, or to bind any successor administration. Only if a minister were, improbably, to give a categorical assurance to Parliament that a power would not be used in a given situation, such that Parliament could be taken to have legislated on that basis, does it seem to me that a parliamentary statement on the scope of a power would be properly admissible.
I think it important that the conditions laid down by the House in Pepper v. Hart should be strictly insisted upon. Otherwise, the cost and inconvenience feared by Lord Mackay, whose objections to relaxation of the exclusionary rule were based on considerations of practice not principle (see p. 615G), will be realised. The worst of all worlds would be achieved if parties routinely combed through Hansard, and the courts dredged through conflicting statements of parliamentary intention (see p. 631F), only to conclude that the statutory provision called for no further elucidation or that no clear and unequivocal statement by a responsible minister could be derived from Hansard. I would further draw attention to the terms of Practice Direction (Hansard: Citation)  1 WLR 192 and Practice Direction (House of Lords: Supporting Documents)  1 WLR 303.
....I do not for my part find that the first threshold test for resorting to Hansard is met. In this, as in most cases, the statute should be treated as "the formal and complete intimation to the citizen of a particular rule of the law which he is enjoined, sometimes under penalty, to obey and by which he is both expected and entitled to regulate his conduct" (per Lord Oliver of Aylmerton, Pepper v. Hart, at 619H). The present case illustrates the dangers of weakening this first threshold test. The House has been referred, as was the Court of Appeal, to a number of statements by several ministers with responsibility for the Bill.....[N]owhere did ministers attempt to give a comprehensive legal definition of what s.11 meant. In my view, the third threshold test under Pepper v. Hart, is not satisfied in this case: there was no clear and unequivocal statement....
LORD NICHOLLS: ....I have had the advantage of reading in draft the speech of my noble and learned friend Lord Bingham of Cornhill. In agreement with him, I would allow this appeal. The one point on which I part company with him concerns the use of Hansard. On this matter there is a measure of disagreement between your Lordships.
I go back to first principles. The present appeal raises a point of statutory interpretation: what is the ambit of the power conferred on the minister by section 31(1) of the Landlord and Tenant Act 1985? No statutory power is of unlimited scope. The discretion given by Parliament is never absolute or unfettered. Powers are conferred by Parliament for a purpose, and they may be lawfully exercised only in furtherance of that purpose: 'the policy and objects of the Act', in the oft-quoted words of Lord Reid in Padfield v. Minister of Agriculture, Fisheries and Food  AC 997,1030. The purpose for which a power is conferred, and hence its ambit, may be stated expressly in the statute. Or it may be implicit. Then the purpose has to be inferred from the language used, read in its statutory context and having regard to any aid to interpretation which assists in the particular case. In either event, whether the purpose is stated expressly or has to be inferred, the exercise is one of statutory interpretation.
Statutory interpretation is an exercise which requires the court to identify the meaning borne by the words in question in the particular context. The task of the court is often said to be to ascertain the intention of Parliament expressed in the language under consideration. This is correct and may be helpful, so long as it is remembered that the 'intention of Parliament' is an objective concept, not subjective. The phrase is a shorthand reference to the intention which the court reasonably imputes to Parliament in respect of the language used. It is not the subjective intention of the minister or other persons who promoted the legislation. Nor is it the subjective intention of the draftsman, or of individual members or even of a majority of individual members of either House. These individuals will often have widely varying intentions. Their understanding of the legislation and the words used may be impressively complete or woefully inadequate. Thus, when courts say that such-and-such a meaning 'cannot be what Parliament intended', they are saying only that the words under consideration cannot reasonably be taken as used by Parliament with that meaning. As Lord Reid said in Black-Clawson International Ltd v Papierwerke Waldhof-Aschaffenburg AG  AC 591, 613: 'We often say that we are looking for the intention of Parliament, but that is not quite accurate. We are seeking the meaning of the words which Parliament used.'
In identifying the meaning of the words used, the courts employ accepted principles of interpretation as useful guides. For instance, an appropriate starting point is that language is to be taken to bear its ordinary meaning in the general context of the statute..... The principles of interpretation include also certain presumptions. To take a familiar instance, the courts presume that a mental ingredient is an essential element in every statutory offence unless Parliament has indicated a contrary intention expressly or by necessary implication.
Additionally, the courts employ other recognised aids. They may be internal aids. Other provisions in the same statute may shed light on the meaning of the words under consideration. Or the aids may be external to the statute, such as its background setting and its legislative history. This extraneous material includes reports of Royal Commissions and advisory committees, reports of the Law Commission (with or without a draft Bill attached), and a statute's legislative antecedents.
Use of non-statutory materials as an aid to interpretation is not a new development. As long ago as 1584 the Barons of the Exchequer enunciated the so-called mischief rule. In interpreting statutes courts should take into account, among other matters, 'the mischief and defect for which the common law did not provide': Heydon's Case (1584) 3 Co Rep 7a, 7b. Nowadays the courts look at external aids for more than merely identifying the mischief the statute is intended to cure. In adopting a purposive approach to the interpretation of statutory language, courts seek to identify and give effect to the purpose of the legislation. To the extent that extraneous material assists in identifying the purpose of the legislation, it is a useful tool.
This is subject to an important caveat. External aids differ significantly from internal aids. Unlike internal aids, external aids are not found within the statute in which Parliament has expressed its intention in the words in question. This difference is of constitutional importance. Citizens, with the assistance of their advisers, are intended to be able to understand parliamentary enactments, so that they can regulate their conduct accordingly. They should be able to rely upon what they read in an Act of Parliament. This gives rise to a tension between the need for legal certainty, which is one of the fundamental elements of the rule of law, and the need to give effect to the intention of Parliament, from whatever source that (objectively assessed) intention can be gleaned......
This constitutional consideration does not mean that when deciding whether statutory language is clear and unambiguous and not productive of absurdity, the courts are confined to looking solely at the language in question in its context within the statute. That would impose on the courts much too restrictive an approach. No legislation is enacted in a vacuum. Regard may also be had to extraneous material, such as the setting in which the legislation was enacted. This is a matter of everyday occurrence.
That said, courts should nevertheless approach the use of external aids with circumspection. Judges frequently turn to external aids for confirmation of views reached without their assistance. That is unobjectionable. But the constitutional implications point to a need for courts to be slow to permit external aids to displace meanings which are otherwise clear and unambiguous and not productive of absurdity. Sometimes external aids may properly operate in this way. In other cases, the requirements of legal certainty might be undermined to an unacceptable extent if the court were to adopt, as the intention to be imputed to Parliament in using the words in question, the meaning suggested by an external aid. Thus, when interpreting statutory language courts have to strike a balance between conflicting considerations.
For some years before 1993 a self-imposed judicial rule precluded use of parliamentary proceedings as an external aid. This exclusionary rule was relaxed by this House in Pepper v Hart, so as to permit use of parliamentary materials as an aid to construction where certain conditions are satisfied. One of these conditions is that the legislation must be ambiguous or obscure, or lead to an absurdity: see Lord Browne-Wilkinson  AC, 593 at 640.
I can see nothing in this formulation or in principle to suggest that the ambiguity or obscurity or absurdity must be of any particular type. The purpose for which a statutory power is conferred is just as much a question of interpretation of the statutory provision as is the meaning of a particular word or phrase. It cannot be right for the courts to look at parliamentary proceedings, if they assist, on the interpretation of a particular word or phrase, but to decline to look at parliamentary proceedings, however much assistance they may give, when deciding, as a matter of interpretation, what was the purpose for which a power was conferred. The point is underlined by noting that, if drawn, this distinction has the consequence that, in the latter type of case, the courts will look at other forms of extraneous material if they assist, such as statements in Government white papers, but not at what was said by Government ministers in Parliament. This would not be a rational distinction.
Experience has shown that the occasions on which reference to parliamentary proceedings is of assistance are rare. To be of assistance as an external aid, the parliamentary statement relied upon must be clear and unequivocal. Otherwise it is of no real use. Parliamentary statements seldom satisfy this test on the points of interpretation which come before the courts. Increasing awareness of the lack of help provided by parliamentary material will, it is to be hoped, result in counsel being more realistic and more sparing in their references to such material.....
If the parliamentary statements relied upon are not clear, they are of little or no value and cannot qualify as an external aid in the particular case. They will fail to satisfy the third of Lord Browne-Wilkinson's conditions: see Pepper v Hart  AC 593, 640.
If, however, the statements are clear, and were made by a minister or other promoter of the Bill, they qualify as an external aid. In such a case the statements are a factor the court will take into account in construing legislation which is ambiguous or obscure or productive of absurdity. They are then as much part of the background to the legislation as, say, Government white papers. They are part of the legislative background, but they are no more than this. This cannot be emphasised this too strongly. Government statements, however they are made and however explicit they may be, cannot control the meaning of an Act of Parliament. As with other extraneous material, it is for the court, when determining what was the intention of Parliament in using the words in question, to decide how much importance, or weight, if any, should be attached to a Government statement. The weight will depend on all the circumstances. For instance, the statement might conflict with the principle of interpretation that penal legislation is to be construed strictly.