21In section 132(2) of the [1975 c. 14.] Social Security Act 1975 (meaning of " continental shelf operations ") for the words from " the exploitation " onwards there shall be substituted the words " any activities which, if paragraphs (a) and (d) of subsection (6) of section 23 of the Oil and Gas (Enterprise) Act 1982 (application of civil law to certain offshore activities) were omitted, would nevertheless fall within subsection (2) of that section. "