Privity of contract is a common law doctrine which provides that you cannot either enforce the benefit of or be liable for any obligation under a contract to which you are not a party. The underlying premise is that only parties to a contract can sue or be sued under it.
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A number of equitable and statutory exceptions to the doctrine of privity of contract exist, most notably under the Contracts ( Rights of Third Parties ) Act 1999 which permits a third party to enforce a contract where the contract itself either expressly provides for this or purports to confer such a benefit.
Lexis dictionary