Credit Act 1984

Where, in accordance with a provision in a credit sale contract or a loan contract, the credit provider exercises a right under the contract to vary the contract (otherwise than at the request of the debtor or in a manner referred to in section 37, 69, 70 or 71) the variation does not have effect until the prescribed period (or, where the contract provides for a longer period of notice of the variation, that longer period) has elapsed after notice of the variation has been given to the debtor.

Where notice of the variation of a credit sale contract or loan contract is given in a common form and posted by bulk postage, the notice shall be deemed to have been given 21 days after the date on which the last of the bulk postages was made.