The orthodoxy of non-intervention even by a supreme appellate court to reopen the construction of ambiguous statutes was accepted by the House of Lords in Hanau v. Ehrlich [51] where Earl Loreburn L.C. said:
I agree with Vaughan Williams L.J. that it is not right for even this House to reopen points of construction upon ambiguous language which have been settled for a long period of years; and I advise your Lordships to decide this case upon that ground. To my mind, when doubtful words in a statute have for a long period been decided in a particular sense, we ought not to reopen the matter if we can help it. The doctrine "Interest reipublicae ut sit finis litium" ought in such a case to apply.
The ground of this decision, according to Craies on Statute Law, 7th ed. (1971), p. 154, is the axiom stare decisis. That axiom attributes authority to judicial precedents in order "to keep the scale of justice steady, and not liable to waver with every new judge's opinion", the first decision being a solemn declaration that "what before was uncertain and perhaps indifferent, is now become a permanent rule": Broom's Legal Maxims, 10th ed. (1939), p. 90. However, when a court is faced with an earlier decision of long standing construing an ambiguous statute and the earlier decision is not binding upon it, the court must decide where the balance of advantage lies between intervening and not intervening to re-examine and perhaps to correct the earlier decision, even when the problem arises before a court of final instance with respect to one of its own decisions: Geelong Harbour Trust Commissioners v. Gibbs Bright & Co. [52] ;Baker v. Campbell [53] . If the problem arises with respect to a decision by a lower court, a number of factors fall for consideration in deciding where the balance of advantage lies: see Halsbury's Laws of England, 4th ed., vol. 26, par. 581. On the one hand, there is Lord Loreburn's speech in West Ham Union v. Edmonton Union [54] :
Great importance is to be attached to old authorities, on the strength of which many transactions may have been adjusted and rights determined. But where they are plainly wrong, and especially where the subsequent course of judicial decisions has disclosed weakness in the reasoning on which they were based, and practical injustice in the consequences that must flow from them, I consider it is the duty of this House to overrule them, if it has not lost the right to do so by itself expressly affirming them.
On the other hand, the general reluctance of a court of final instance to intervene appears in Lord Reid's speech in Campbell College, Belfast (Governors) v. Northern Ireland Valuation Commissioner [55] :
I would not seek to lay down any general rule as to the circumstances which ought to prevent this House from correcting a long standing error. But one consideration is, I think, of paramount importance. In arranging their affairs people are entitled to rely on a decision which appears to have gone unchallenged, and it would require some exceptional reason to justify a reversal if it appeared that that was likely to create any serious embarrassment for those who had acted on the faith of what seemed to be settled law.
The circumstances in which Lord Loreburn contemplated that the power to overrule might be exercised have not been treated as conditions always to be satisfied before the court intervenes: see Brownsea Haven Properties Ltd. v. Poole Corporation [56] . This is perhaps inevitable in an area where considerations of practical justice or injustice may be particularly persuasive.
1. [1919] A.C. 815, at p. 874.
2. [1912] A.C. 39, at p. 41.
3. (1974) 129 C.L.R. 576, at pp. 583-584.
4. (1983) 153 C.L.R. 52, at p. 103.
5. [1908] A.C. 1, at pp. 4-5.
6. [1964] 1 W.L.R. 912, at p. 918; [1964] 2 All E.R. 705, at p. 710.
7. [1958] Ch. 574, at p. 604.