ABSTRACT

Photo Production Ltd v Securicor Transport Ltd [1980] AC 827, p 848 Lord Diplock: My Lords, it is characteristic of commercial contracts, nearly all of which today are entered into not by natural legal persons, but by fictitious ones, that is, companies, that the parties promise to one another that something will be done, for instance, that property and possession of goods will be transferred, that goods will be carried by ship from one port to another, that a building will be constructed in accordance with agreed plans, that services of a particular kind will be provided. Such a contract is the source of primary legal obligations on each party to it to procure that whatever he has promised will be done is done. (I leave aside arbitration clauses which do not come into operation until a party to the contract claims that a primary obligation has not been observed.)

Where what is promised will be done involves the doing to a physical act, performance of the promise necessitates procuring a natural person to do it; but the legal relationship between the promisor and the natural person by whom the act is done, whether it is that of master and servant, or principal and agent or of parties to an independent subcontract, is generally irrelevant. If that person fails to do it in the manner in which the promisor has promised to procure it to be done, as, for instance, with reasonable skill and care, the promisor has failed to fulfil his own primary obligation. This is to be distinguished from ‘vicarious liability’, a legal concept which does depend on the existence of a particular legal relationship between the natural person by whom a tortious act was done and the person sought to be made vicariously liable for it. In the interests of clarity the expression should, in my view, be confined to liability for tort.