"The Commissioners shall make regulations for securing a fair and reasonable attribution of input tax to supplies … and any such regulations may provide for— (a) determining a proportion by reference to which input tax for any prescribed accounting period is to be provisionally attributed to those supplies; . . . "
"Whereas the rules governing deductions should be harmonized to the extent that they affect the actual amounts collected; whereas the deductible proportion should be calculated in a similar manner in all the member states;"
"The following shall be subject to Value Added Tax: 1. the supply of goods or services effected for consideration within the territory of the country by a taxable person acting as such; 2. the importation of goods."
"2. In so far as the goods and services are used for the purposes of his taxable transactions, the taxable person shall be entitled to deduct from the tax which he is liable to pay: (a) value added tax due or paid in respect of goods or services supplied or to be supplied to him by another taxable person; . . . 3. Member states shall also grant to every taxable person the right to a deduction or refund of the value added tax referred to in paragraph 2 in so far as the goods and services are used for the purposes of: (a) transactions relating to the economic activities . . . carried out in another country, which would be eligible for deduction of tax if they had occurred in the territory of the country; . . . 5. As regards goods and services to be used by a taxable person both for transactions covered by paragraphs 2 and 3, in respect of which value added tax is deductible, and for transactions in respect of which value added tax is not deductible, only such proportion of the value added tax shall be deductible as is attributable to the former transactions. This proportion shall be determined, in accordance with article 19, for all the transactions carried out by the taxable person. However, member states may: . . . (c) authorize or compel the taxable person to make the deduction on the basis of the use of all or part of the goods and services; (d) authorize or compel the taxable person to make the deduction in accordance with the rule laid down in the first subparagraph, in respect of all goods and services used for all transactions referred to therein;"
"(1) The amount of input tax for which a taxable person is entitled to credit at the end of any period shall be so much of the input tax for the period …. as is allowable by or under regulations as being attributable to supplies within subsection (2) below. (2) The supplies within this subsection are the following supplies made or to be made by the taxable person in the course or furtherance of his business— (a) taxable supplies; (b) supplies outside the United Kingdom which would be taxable supplies if made in the United Kingdom; . . . "
"Subject to regulation 31 below, the amount of input tax which a taxable person shall be entitled to deduct provisionally shall be that amount which is attributable to taxable supplies in accordance with this regulation."
"In respect of each prescribed accounting period: (b) there shall be attributed to taxable supplies the whole of the input tax on such of those goods or services as are used or to be used by him exclusively in making taxable supplies; (c) no part of the input tax on such of those goods or services as are used or to be used by him exclusively in making exempt supplies, or in carrying on any activity other than the making of taxable supplies, shall be attributed to taxable supplies;"
"(d) there shall be attributed to taxable supplies such proportion of the input tax on such of those goods or services as are used or to be used by him in making both taxable and exempt supplies as bears the same ratio to the total of such input tax as the value of taxable supplies made by him bears to the value of all supplies made by him in the period."
"Input tax incurred by a taxable person in any prescribed accounting period on goods imported or acquired by, or goods or services supplied to, him which are used or to be used by him in whole or in part in making— (a) supplies outside the United Kingdom which would be taxable supplies if made in the United Kingdom; . . . shall be attributed to taxable supplies to the extent that the goods or services are so used or to be used, expressed as a proportion of the whole use or intended use."
"…. regulation 32 is ancillary to regulation 30 and simply designed to ensure that out-of-country supplies are (in line with the scheme of the Sixth Directive) treated in the same way as taxable supplies. This means, in effect, treating the word 'taxable supplies' in regulation 30(2)(d) in other than its ordinary sense."