Derogation from grant
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It is a general principle of law that if person A grants an interest in land to person B, he must not then act in such a way as to make that grant worthless. A good example is harmer v jumbil (1921), in which the Landlord was held to have granted a worthless Lease, by making it impossible for the lessees to use the land for the purpose for which they had leased it.