" … it is open to the parties to an English contract to agree e.g. that the liability of an agent to his principal shall be determined in accordance with the relevant articles of the French Civil Code. In such a case the foreign law becomes a source of law upon which the governing law may draw. The effect is not to make French law the governing law of the contract but rather to incorporate the French articles as contractual terms into an English contract. This is a convenient 'shorthand' alternative to setting out the French articles verbatim. The court will then have to construe the English contract, 'reading into it as if they were written into it the words' of the French statute. 32-087 It often happens that statutes governing the liability of a sea carrier, such as the former Harter Act in the United States, or statutes implementing the Hague Rules … are thus 'incorporated' in a contract governed by a law other than that of which the statute forms part. The statute then operates not as a statute but as a set of contractual terms agreed upon between the parties. The parties may make an express choice of one law (e.g. English law) and then incorporate the terms of a foreign statute. In such a case the incorporation of the foreign statute would only have effect as a matter of contract." 51. It does not seem to me that the passage cited or the authorities referred to in the notes thereto, assist the defendants. The doctrine of incorporation can only sensibly operate where the parties have by the terms of their contract sufficiently identified specific 'black letter' provisions of a foreign law or an international code or set of rules apt to be incorporated as terms of the relevant contract such as a particular article or articles of the French Civil Code or the Hague Rules. By that method, English law is applied as the governing law to a contract into which the foreign rules have been incorporated. In such a case, in construing and applying those rules, where there is ambiguity or doubt as to their ambit or effect, it may be appropriate for the court to have regard to evidence from experts in foreign law as to the way in which the provisions identified have been interpreted and applied in their 'home' jurisdiction. However, that is still only as an end to interpretation by the English court in the course of applying English law and rules of construction to the contract with which it is concerned. . . . ” " … it is open to the parties to an English contract to agree e.g. that the liability of an agent to his principal shall be determined in accordance with the relevant articles of the French Civil Code. In such a case the foreign law becomes a source of law upon which the governing law may draw. The effect is not to make French law the governing law of the contract but rather to incorporate the French articles as contractual terms into an English contract. This is a convenient 'shorthand' alternative to setting out the French articles verbatim. The court will then have to construe the English contract, 'reading into it as if they were written into it the words' of the French statute. 32-087 It often happens that statutes governing the liability of a sea carrier, such as the former Harter Act in the United States, or statutes implementing the Hague Rules … are thus 'incorporated' in a contract governed by a law other than that of which the statute forms part. The statute then operates not as a statute but as a set of contractual terms agreed upon between the parties. The parties may make an express choice of one law (e.g. English law) and then incorporate the terms of a foreign statute. In such a case the incorporation of the foreign statute would only have effect as a matter of contract."
“It seems to me, in the light of Shamil, that if Jewish law is not available as the applicable law under the Rome Convention, there is no realistic prospect of successfully contending that the parties impliedly incorporated halachah (or such of it as relates to contracts) as a term or terms of the compromise agreement. No terms have been identified, let alone pleaded, as the corpus of terms apt to be implied. Further the effect of the supposed implication would be to substitute halachah law for Swiss or English law. This would be inconsistent with either of those laws being the applicable law. Those laws would only be a shell in which to incorporate a different non national law.”
"The act of destruction of the documents is one which has benefited the defendants and prejudiced the claimants. It can neither be undone nor reversed. Nor can any pecuniary relief put the claimants in as good a position as they would have been in if the agreement could have been rescinded and matters restored to the position in which they were before the agreement was made… Accordingly restitutio in integrum would not appear to be possible. It is not however clear that an inability to make restitutio in integrum is a bar to avoidance of a contract on the ground of duress. Avoidance of a contract for duress (as opposed to rescission for undue influence) is a common law remedy. In essence the illegitimate pressure imposed on the victim renders his apparent consent revocable: Anson's Law of Contract, 274. If, after the illegitimate pressure has ceased to operate, the victim treats the contract as valid, he can no longer revoke it. Equity, as a condition of granting rescission where there has been undue influence would require restitutio, at least in substance. It does not however necessarily follow that, if the victim of duress has not affirmed the contract, he loses his right of revocation if he cannot restore the other party to substantially the same position. At any rate I decline on an application for summary judgment to rule that that is so."
“whether a party can avoid a contract procured by duress in circumstances where he cannot offer the other party substantial restitutio in integrum.”
“… a Court of Equity could not give damages, and, unless it can rescind the contract, can give no relief. And, on the other hand, it can take accounts of profits, and make allowance for deterioration. And I think the practice has always been for a Court of Equity to give this relief whenever, by the exercise of its powers, it can do what is practically just, though it cannot restore the parties precisely to the state they were in before the contract.”
"Most importantly, it appears that the bar that restitutio in integrum is impossible generally does not apply to rescission for duress. The explanation for that is that it would generally contradict the basis for the claimant's restitution to recognise a counter-claim by the defendant: if it was illegitimate for the defendant to demand a sum of money for a particular consideration, for example, carrying out work, it would be inconsistent then to award the defendant counter-restitution for that work."
“… there is an obvious analogy between setting aside a disposition for duress or undue influence and setting it aside for fraud. In each case -and to quote the words of Holmes J. in Fairbanks v Snow (1887) 13 NE 596, 598 – ‘the party has been subjected to an improper motive for action.’”
“The issue of restitutio in integrum has not presented itself in cases of rescission for common law duress. This is probably because in most cases of duress the complainant has simply paid money or agreed to pay money without receiving any benefit that he needs to return upon rescission. Since in such cases the question is only about the repayment of the money by the defendant, there is no issue in restitutio in integrum. The lack of discussion on this issue in case of rescission for duress should not be taken to mean that restitutio in integrum is not a requirement for rescission on the grounds of duress. If A is induced by B’s duress to enter into a contract to buy B’s car, it is unlikely that the court will allow rescission of the contract so that A can recover the price paid to B without insisting that A should return B’s car. It would not be inconsistent with the basis of A’s restitution for the court to insist on counter-restitution by A. In any event, restitutio in integrum is clearly a requirement in the case of rescission for other common law vitiating factors such as fraudulent misrepresentation.”
“Whereas fraudulent misrepresentation or indeed any misrepresentation is reliant upon a wrong that is extrinsic to the contract itself, as it merely induces a contract, duress by contrast is directly and intimately bound up with the contract formation, that is to say, the improper conduct operates at the point of entry into the contract itself. Effectively the victim’s autonomy is threatened. Since mutuality is at the heart of contract an avoided contract cannot be enforced in either direction and no benefits including counter restitution can be sought. Effectively, once the contract is avoided for duress and the victim as an act of self-help takes back that which he parted with and/or is relieved from unperformed obligations, the loss lies where it falls in a manner analogous to illegality.”
“…, the modern statement of the law is that, impossibility of restitutio in integrum is no longer a bar to relief when a claimant seeks to avoid/rescind a contract on the grounds of duress or under influence. Instead the Court’s approach is to do practical justice between the parties by making orders for counter restitution, even if they cannot restore them to the precise position they were in prior to the contract being rescinded… The correct approach is that counter-restitution is never in fact impossible: it should always be possible for the party seeking to rescind to pay a Defendant a sum of money to reflect counter-restitution of the value of benefits received by him. There can be no rational reason in a system of fused administration of law and equity why the liberal approach taken in equity cannot also be taken at common law…”
“Despite this criticism, the decision in O’Sullivan is highly significant for one can strongly argue that, by its willingness to award complex mutual restitution, the Court of Appeal has effectively emptied the traditional ‘restitutio in integrum must be possible’ bar of any content. What is required is that the rescinding claimant makes counter-restitution, whether specifically or by a monetary equivalent: counter-restitution may be difficult to assess but it is never impossible.”
“… it was the defendant who was anxious that those letters should be destroyed. I cannot in those circumstances treat the letters as so important to him that there can be no rescission because they cannot be brought back into existence.”
“… wherever there is any conflict or variance between the rules of equity and the common law with reference to the same matter, the rules of equity shall prevail.”
“Equity identified two forms of unacceptable conduct. The first comprises overt acts of improper pressure or coercion such as unlawful threats. Today there is much overlap with the principle of duress as this principle has subsequently developed.”
“…. there was a protection gap between the two doctrines, with equity affording wider protection through undue influence than the common law through duress. In the past this protection gap was very wide, but the great expansion in the scope of duress in recent times has resulted in considerable overlap between the two doctrines, since both deal with overt acts of improper pressure such as unlawful threats.”
“In the modern law the historical divide between common law and equity should not be allowed to drive a wedge through uniting principle.”
“…nothing here turns on the distinction between common law and equity. One simply has different types of threats or pressure. Duress at common law traditionally comprised merely threats to the person but has since been expanded to include duress of goods and economic duress. Actual undue influence, in so far as concerned with threats or pressure as opposed to influencing another, covers other types of threat or pressure with many of the cases concerning threats to prosecute, sue or publish information about the claimant. The law can be perfectly well described by saying that all these various types of pressure or threat inducing a contract render the contract voidable. There is nothing to be gained by here referring to actual undue influence as opposed to duress or, more generally, there is nothing to be gained by here referring to common law and equity.”