6.—(1) Subject to paragraph (2) below and article 16 below, a taxable person who does not fall within article 5 above shall fall within this article if the total amount of tax which he was liable to pay in respect of the prescribed accounting periods the ends of which fell within any one period of one year ending on the last day of a prescribed accounting period of his ending after 31st May 1993 exceeded £2,000,000.
(2) Where in the period of the year referred to in paragraph (1) above a prescribed accounting period of the taxable person did not begin on the first day or did not end on the last day of a month, that period of one year shall, for the purpose of this article, be regarded as having comprised those prescribed accounting periods which related to the tax periods ending within that period of one year to which references are shown in the certificate of registration issued to him.