445. Passing of benefit and burden; in general.

It is a general principle of the law of contract that a contract cannot confer rights or impose obligations on persons who are not parties to the contract1, although the Contracts (Rights of Third Parties) Act 1999 now enables a third party to enforce a term of certain contracts2 in his own right if the contract expressly provides that he may or the term purports to confer a benefit on him3. A lease of land may, however, last for many years and the reversion and the term are normally freely transferable4. Consequently, it became necessary that covenants in leases