... no one is legally bound to do so, it is said 'to be an offer to the whole world'. One party with no need for any other negotiations makes the reward or offer. The 'acceptance' of this type of contract is in the actual performance, or specified conduct, which is required to receive the reward, looking for, finding, and then delivering to the offeror. See Errington v Errington [1952] 1 ALL ER 149 and Carlill v Carbolic Smokeball Co [1893] 1 QB 256. In Errington v Errington; A father who gave a house to his daughter and son in law, on the condition that they keep up the mortgage payments, was held to be a unilateral contract, and the mortgage payments were considered to be the performance, even though the father died, the offer of the house could not be revoked as the performance, the payments had already started. When ...

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