“(1) Where a person— (a) has accounted to the Commissioners for VAT for a prescribed accounting period (whenever ended), and (b) in doing so, has brought into account as output tax an amount that was not output tax due, the Commissioners shall be liable to credit the person with that amount. […] (2) The Commissioners shall only be liable to credit or repay an amount under this section on a claim being made for the purpose. […] (3) It shall be a defence, in relation to a claim under this section by virtue of subsection (1) or (1A) above, that the crediting of an amount would unjustly enrich the claimant. […] (4) The Commissioners shall not be liable on a claim under this section— (a) to credit an amount to a person under subsection (1) or (1A) above, or (b) to repay an amount to a person under subsection (1B) above, if the claim is made more than 4 years after the relevant date. […] (4ZA) The relevant date is— (a) in the case of a claim by virtue of subsection (1) above, the end of the prescribed accounting period mentioned in that subsection… […] (7) Except as provided by this section, the Commissioners shall not be liable to credit or repay any amount accounted for or paid to them by way of VAT that was not VAT due to them.” (a) has accounted to the Commissioners for VAT for a prescribed accounting period (whenever ended), and (b) in doing so, has brought into account as output tax an amount that was not output tax due, (a) to credit an amount to a person under subsection (1) or (1A) above, or (b) to repay an amount to a person under subsection (1B) above, if the claim is made more than 4 years after the relevant date. 12. The effect of section 80(1) is that a claim for repayment may only be made by a person who has accounted for output tax to HMRC: in other words, by a supplier who has charged VAT to the recipient of its supply. Section 80 makes no provision for a claim to be made to HMRC by the recipient of a supply who has borne the burden of tax on that supply. Taken on its own, that would not exclude the possibility that a claim by the recipient of a supply could be made by means of an ordinary action for payment founded upon a non-statutory remedy such as recompense for unjustified enrichment. However, section 80(7) creates a difficulty for such an action because it provides that HMRC are not liable to repay any amount accounted for or paid to them by way of VAT “except as provided by this section”