“Tracing is thus neither a claim nor a remedy. It is merely the process by which a claimant demonstrates what has happened to his property, identifies its proceeds and the persons who have handled or received them, and justifies his claim that the proceeds can properly be regarded as representing his property. Tracing is also distinct from claiming. It identifies the traceable proceeds of the claimant’s property. It enables the claimant to substitute the traceable proceeds for the original asset as the subject matter of his claim. But it does not affect or establish his claim. That will depend on a number of factors including the nature of his interest in the original asset. He will normally be able to maintain the same claim to the substituted asset as he could have maintained to the original asset. If he held only a security interest in the original asset, he cannot claim more than a security interest in the proceeds. But his claim may also be exposed to potential defences as a result of intervening transactions. Even if the plaintiffs could demonstrate what the bank had done with their money, for example, and could thus identify its traceable proceeds in the hands of the bank, any claim by them to assert ownership of those proceeds would be defeated by the bona fide purchaser defence. The successful completion of a tracing exercise may be preliminary to a personal claim (as in El Ajou v Dollar LandHoldings plc[1993] 3 All ER 717 ) or a proprietary one, to the enforcement of a legal right (as in Trustees of the Property of F C Jones & Sons v Jones[1997] Ch 159 ) or an equitable one. Given its nature, there is nothing inherently legal or equitable about the tracing exercise. There is thus no sense in maintaining different rules for tracing at law and in equity. One set of tracing rules is enough.”