A conveyancing clerk employed by a vendor's solicitors has ostensible authority to grant a short extension of time for settlement, and such an extension operates as a waiver of the right to rescind rather than a variation of the contract. The distinction between waiver and variation is critical: a mere extension substitutes a new date without destroying essentiality, whereas a variation requires consideration and may require writing. George v Pottinger's suggestion that a mere extension amounts to a variation of essentiality is doubted.
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