What is the ratio in Errington v Errington?

Once performance of a unilateral contract has begun, the offeror cannot revoke the offer, and any license granted becomes irrevocable while performance continues in accordance with the contract.

What did the court decide in Errington v Errington?

The Court of Appeal held that the son and daughter-in-law had an irrevocable contractual license to remain in the house and complete the mortgage payments, which the widow could not terminate.

Why is Errington v Errington important for contract law?

It establishes fundamental principles about unilateral contracts and the irrevocable nature of contractual licenses, showing how part performance can create enforceable property rights.

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