16.—(1) Paragraph (2) applies to a claim or assessment if—
(a)the amount of credit given under regulation 4(1) is reduced under regulation 14, or becomes excessive or insufficient by reason of any adjustment of the amount of any bank levy or SRF levy,
(b)the reduction or adjustment gives rise to the claim or assessment, and
(c)the claim or assessment is made not later than 6 years from the date on which all material determinations have been made, whether in the UK or elsewhere.
(2) Nothing in the Tax Acts limiting the time for the making of assessments, or limiting the time for the making of claims for relief, applies to the assessment or claim.
(3) In paragraph (1)(c), “material determinations” means such assessments, reductions, adjustments or other determinations that are material in determining whether any, and (if so) what, credit is to be given.
17.—(1) This regulation applies if—
(a)any credit has been allowed under regulation 4(1), and
(b)later, the amount of that credit is reduced under regulation 14, or becomes excessive as a result of an adjustment of the amount of the SRF levy.
(2) The relevant entity or, in the case of the relevant group, the responsible member must give notice that a reduction has been made or that the amount of the credit has become excessive as a result of the making of an adjustment.
(3) Notice under paragraph (2) is to be given—
(a)to an officer of Revenue and Customs, and
(b)within one year from when the reduction or adjustment is made.