27.—(1) Where the revenue collection counterparty receives a notice under regulation 26(1) (“a dispute notice”) about a determination (or a failure to make a determination) under any provision of these Regulations (“a relevant provision”) it must, by the 28th day after the day on which it receives that notice either—
(a)reject the notice; or
(b)accept the notice (in full or in part) and make such determination under that provision as it thinks is necessary in consequence.
(2) Whether the revenue collection counterparty rejects or accepts a dispute notice, it must, on the same day, issue a notice (“a decision notice”) to the person who gave that dispute notice, setting out its decision and the reasons for it.
(3) Where the revenue collection counterparty makes a determination under a relevant provision by virtue of paragraph (1)(b) it must, on the same day, issue to each electricity supplier who may be affected by the making of that determination a notice which sets out that determination.
(4) Where the revenue collection counterparty makes a determination under a relevant provision by virtue of paragraph (1)(b) and—
(a)that provision requires the determination to be made by a particular time which has passed, that determination has effect notwithstanding that requirement;
(b)that provision requires something to be done by it by a particular time which has passed, that thing must be done as soon as reasonably practicable after the determination.
(5) Where the revenue collection counterparty makes a determination under a relevant provision by virtue of paragraph (1)(b) and that provision requires an electricity supplier to make a payment, that payment must be made (notwithstanding what that provision says about the time by which a payment must be made) by the date specified by the revenue collection counterparty in the notice issued under paragraph (3) to that supplier, that date being no earlier than—
(a)the date by which, in the opinion of the revenue collection counterparty, it would be reasonably practicable for that electricity supplier to make that payment; or
(b)the earliest date by which that supplier would have had to have made that payment if the determination had been made at the time the determination which is the subject of the dispute notice was or (in the case where the revenue collection counterparty failed to make a determination) should have been made.
(6) Where an electricity supplier has paid an amount to the revenue collection counterparty, or the revenue collection counterparty has paid an amount to that electricity supplier, and a determination made under a relevant provision by virtue of paragraph (1)(b) means that that amount should not have been paid, that amount must be returned to the person who paid it by—
(a)the 5th working day after the day on which the notice issued in respect of that determination was issued under paragraph (3);
(b)where the revenue collection counterparty is of the opinion that it would not be reasonably practicable for that amount to be returned by that date, such later date as the revenue collection counterparty specifies in the notice issued under paragraph (3) to that supplier in respect of that determination.