“Equity lawyers habitually use the expressions ‘the tracing claim’ and ‘the tracing remedy’ to describe the proprietary claim and the proprietary remedy which equity makes available to the beneficial owner who seeks to recover his property in specie from those into whose hands it has come. Tracing properly so-called, however, is neither a claim nor a remedy but a process. Moreover, it is not confined to the case where the plaintiff seeks a proprietary remedy; it is equally necessary where he seeks a personal remedy against the knowing recipient or knowing assistant. It is the process by which the plaintiff traces what has happened to his property, identifies the persons who have handled or received it, and justifies his claim that the money which they handled or received (and if necessary which they still retain) can properly be regarded as representing his property. He needs to do this because his claim is based on the retention by him of a beneficial interest in the property which the defendant handled or received. Unless he can prove this, he cannot (in the traditional language of equity) raise an equity against the defendant or (in the modern language of restitution) show that the defendant’s unjust enrichment was at his expense.”
“If the plaintiff succeeds in tracing his property, whether in its original or in some changed form, into the hands of the defendant, and overcomes any defences which are put forward on the defendant’s behalf, he is entitled to a remedy. The remedy will be fashioned to the circumstances. The plaintiff will generally be entitled to a personal remedy; if he seeks a proprietary remedy he must usually prove that the property to which he lays claim is still in the ownership of the defendant. If he succeeds in doing this, the court will treat the defendant as holding the property on a constructive trust for the plaintiff and will order the defendant to transfer it in specie to the plaintiff. But this is only one of the proprietary remedies which is available to a court of equity. If the plaintiff’s money has been applied by the defendant, for example, not in the acquisition of a landed property but in its improvement, then the court may treat the land as charged with the payment to the plaintiff of a sum representing the amount by which the value of the defendant’s land has been enhanced by the use of the plaintiff’s money.”
“Tracing is the process of identifying a new asset as the substitute for an original asset which was misappropriated from the claimant. Where one asset is exchanged for another, the claimant may elect to treat the substituted asset as representing the value contained in the original asset. He is said to trace the value represented in the original asset into the substitute.”
“Can then the sums improperly used from the purchaser’s moneys be traced into the policy moneys Tracing is a process whereby assets are identified... The question of tracing which does arise is whether the rules of tracing are those regulating tracing through a mixed fund or those regulating the position when moneys of one person have been innocently expended on the property of another. In the former case (mixing of funds) it is established law that the mixed fund belongs proportionately to those whose moneys were mixed. In the latter case it is equally clear that money expended on maintaining or improving the property of another normally gives rise, at the most, to a proprietary lien to recover the moneys so expended. In certain cases the rules of tracing in such a case may give rise to no proprietary interest at all if to give such interest would be unfair: see In Re Diplock [1948] (Ch) 465, 548.”
“In the present cases, however, the charities have used the Diplock money, not in combination with money of their own to acquire new assets, but in the alteration and improvement of assets which they already owned. The altered and improved asset owes its existence, therefore, to a combination of land belonging to the charity and money belonging to the Diplock estate. The question whether tracing is possible and if so to what extent, and also the question whether an effective remedy by way of declaration of charge can be granted consistently with an equitable treatment of the charity as an innocent volunteer, present quite different problems from those arising in the simple case above stated. In the case of the purchase of an asset out of a mixed fund, both categories of money are, as we have said, necessarily present throughout the existence of the asset in an identifiable form. In the case of adaptation of property of the volunteer by means of trust money, it by no means necessarily follows that the money can be said to be present in the adapted property. The beneficial owner of the trust money seeks to follow and recover that money and claims to use the machinery of a charge on the adapted property in order to enable him to do so. But in the first place the money may not be capable of being followed. In every true sense, the money may have disappeared. A simple example suggests itself. The owner of a house who, as an innocent volunteer, has trust money in his hands given to him by a trustee uses that money in making an alteration to his house so as to fit it better to his own personal needs. The result may add not one penny to the value of the house. Indeed, the alteration may well lower its value; for the alteration, though convenient to the owner, may be highly inconvenient in the eyes of a purchaser. Can it be said in such cases that the trust money can be traced and extracted from the altered asset? Clearly not, for the money will have disappeared leaving no monetary trace behind: the asset will not have increased (or may even have depreciated) in value through its use.”
“But the matter does not end here [so I can take it that these are not cumulative reasons but each stands on its own]. What, for the purposes of the inquiry, is to be treated as ‘the charity property’? Is it to be the whole of the land belonging to the charity, or is it to be only that part of it which was altered or reconstructed, or on which a building has been erected by means of Diplock money? If the latter, the result may well be that the property, both in its original state and as altered or improved, will, when taken in isolation, have little or no value. What would be the value of a building in the middle of Guy’s Hospital without any means of access through other parts of the hospital property? If, on the other hand, the charge is to be on the whole of the charity land, it might well be thought an extravagant result if the Diplock estate, because Diplock money had been used to reconstruct a corner of it, were to be entitled to a charge on the entirety.”
“But it is not merely a question of locating and identifying the Diplock money. The result of a declaration of charge is to disentangle trust money and enable it to be withdrawn in the shape of money from the complex in which it has become involved. This can only be done by sale under the charge. But the equitable owner of the trust money must in this process submit to equality of treatment with the innocent volunteer. The latter too, is entitled to disentangle his money and to withdraw it from the complex. Where the complex originates in money on both sides there is no difficulty and no inequity. Each is entitled to a charge. But if what the volunteer has contributed is not money but other property of his own such as land, what then? You cannot have a charge for land. You can, it is true, have a charge for the value of land, an entirely different thing. Is it equitable to compel the innocent volunteer to take a charge merely for the value of the land when what he has contributed is the land itself? In other words, can equity, by the machinery of a charge, give to the innocent volunteer that which he has contributed so as to place him in a position comparable with that of the owner of the trust fund? In our opinion it cannot.”
“An equitable lien is not dependent upon continued possession of the property and, in this respect, resembles a mortgage. It is also within the definition of mortgage in theLaw of Property Act 1925 . However, it differs from a mortgage per se in that a mortgage is intentionally created by contract whereas an equitable lien arises automatically under some doctrine of equity. Thus, a vendor of land has an equitable lien on it until the full purchase price is paid even if the vendor has conveyed the land to the purchaser and given the purchaser possession. This lien has no right to possession of the land that enables the holder to apply to the court for a declaration of charge and for an order for sale of the land under which the money due will be.”
“...Such a charge is created by an appropriation of specific property to the discharge of some debt or other obligation without there being any change in ownership either at law or in equity, and it confers on the chargee rights to apply to the court for an order for sale or for the appointment of a receiver, but no right to foreclosure (so as to make the property his own) or take possession...”