7. Where the circumstances mentioned in article 4(3) above apply, the effect of paragraph 8 of Schedule 6 to the Act shall be modified so that the value of the supply treated as made shall be taken—
(a)in a case where the consideration for which the relevant telecommunications services were in fact supplied was a consideration in money, to be such amount as is equal to the lower of—
(i)so much of the consideration as exceeds the part of the consideration for the supply by reference to which VAT is chargeable in another member State; and
(ii)so much of the consideration as is properly attributable to the relevant period; and
(b)in a case where that consideration did not consist or not wholly consist of money, to be such amount in money as is equivalent to the lower of—
(i)so much of the consideration as exceeds the part of the consideration for the supply by reference to which VAT is chargeable in another member State; and
(ii)so much of the consideration as is properly attributable to the relevant period.