What is the ratio in Prudential Assurance v London Residuary Body?

A lease must have a certain maximum duration from the outset to be valid; uncertainty as to the lease's end date renders it void.

What did the court decide in Prudential Assurance v London Residuary Body?

The House of Lords held that the lease was void due to uncertainty of term, taking effect only as a tenancy at will.

It reaffirmed the strict certainty of term requirement, preventing attempts to circumvent this fundamental principle of lease validity.

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