47.—(1) A Rule 45 Offer may only be withdrawn, or its terms changed, if the offeree has not previously served notice of acceptance.
(2) The offeror withdraws the offer or changes its terms by serving written notice of the withdrawal or change of terms on the offeree.
(3) Subject to paragraph (1), after the expiry of the relevant period—
(a)the offeror may withdraw the Rule 45 Offer or change its terms without the permission of the Tribunal; or
(b)the Rule 45 Offer may be automatically withdrawn in accordance with its terms.
(4) Where the offeror changes the terms of a Rule 45 Offer to make it more advantageous to the offeree, such improved offer is to be treated, not as the withdrawal of the original Rule 45 Offer, but as the making of a new Rule 45 Offer on improved terms.
(5) Subject to paragraphs (1) and (6), if the offeror serves notice, before the expiry of the relevant period, of withdrawal of the Rule 45 Offer or change of its terms to be less advantageous to the offeree, that notice has effect on the expiry of the relevant period.
(6) If the offeree serves notice of acceptance of the original Rule 45 Offer before expiry of the relevant period but after the offeror has served a notice of withdrawal of that offer or change of its terms to be less advantageous to the offeree, that acceptance has effect unless the Tribunal gives permission for the original Rule 45 Offer to be withdrawn or its terms changed.
(7) The offeror shall apply for such permission—
(a)within seven days of the offeree's notice of acceptance; or
(b)if earlier, before the first day of the substantive hearing.
(8) On an application under paragraph (7), the Tribunal may give permission for the original Rule 45 Offer to be withdrawn or its terms changed if satisfied that there has been a change of circumstances since the making of the original Rule 45 Offer and that it is in the interests of justice to give permission.