CA 10 October 1986. Appeal by purchasers(P) of a leasehold flat in London held for a term of 99 years from 29 September 1970. Contract for sale was entered into on 10 July 1985. Completion date was 29 November 1985 and the contract incorporated the National Conditions of Sale (NSC) (20th ed). Condition 11(5) applied with the effect that if the contract was rescinded by the vendor the deal would be called off. The vendor`s solicitors informed P that the landlord`s requirements before giving a license for assignment included two guarantors who should be British based. In the absence of guarantors being provided the vendors solicitors threatened to rescind the contract. On 2 December the vendors` solicitors purported to exercise the power under condition 11(5) to rescind the contract because landlord`s consent had not been obtained. Shortly afterwards two guarantors and references were accepted by the landlord`s agents from P`s solicitors. P registered a caution against the title and is