“(2) No VAT may be treated as if it were input tax under paragraph (1) above— (a) in respect of— (i) goods or services which had been supplied, or (ii) save as the Commissioners may otherwise allow, goods which had been consumed, by the relevant person before the date with effect from which the taxable person was, or was required to be, registered;”
“(2) At the time of claiming deduction of input tax in accordance with paragraph (1) above, a person shall, if the claim is in respect of— (a) a supply from another taxable person, hold the document which is required to be provided under regulation 13… provided that where the Commissioners so direct, either generally or in relation to particular cases or classes of cases, a claimant shall hold or provide such other … evidence of the charge to VAT as the Commissioners may direct.”