Landlord and tenant – Determination of lease. In the course of a dispute with the local authority, the defendants sought to determine the lease on premises rented from the claimant company, Sirhowy. Sirhowy contended that breaches committed by the defendants were such as to prevent the lease from being determined. The Chancery Division held that, on the evidence, the defendants could not be considered to have observed and performed all their covenants when they had served notice to determine the lease. It followed that the notice had not have taken effect.