(1) This section applies where the creditor or owner under an agreement is under a duty to give the debtor or hirer notices under section 86B but fails to give him such a notice -
(a) within the period mentioned in subsection (2)(a) of that section; or
(b) within the period of six months beginning with the day after the day on which such a notice was last given to him.
(2) This section also applies where the creditor under an agreement is under a duty to give the debtor a notice under section 86C but fails to do so before the end of the period mentioned in subsection (2) of that section.
(3) The creditor or owner shall not be entitled to enforce the agreement during the period of non-compliance.
(4) The debtor or hirer shall have no liability to pay -
(a) any sum of interest to the extent calculated by reference to the period of non-compliance or to any part of it; or
(b) any default sum which (apart from this paragraph) -
(i) would have become payable during the period of non-complian
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