(1) Where a self-employed contributor ceases insurable self-employment in a contribution year and does not become an employed contributor in that contribution year and is a person to whom paragraph (a) or (c) of section 18(1) applies, self-employment contributions shall be payable by him at the percentage amount or the amount specified in the said paragraphs, whichever is the greater.

(2) In the case of a person to whom this article applies, the number of contribution weeks in respect of which self-employment contributions shall be regarded as having been paid shall, provided that the total amount of self-employment contributions payable by virtue of sub-article (1) have been paid, be 52 in any contribution year.