An obligation to use 'reasonable endeavours' to satisfy conditions precedent does not require a party to accept uncommercial terms or act against its own commercial interests. The implied duty to co-operate does not add to an express obligation to use reasonable endeavours and cannot override express contractual terms. A distinction exists between a landlord's actual written consent to assignment of a lease and an agreement to consent in the future on conditions; unsigned deeds of consent do not constitute written consent.
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