In subsection (1) of section 8 of the Customs and Excise Management Act 1979 (functions of Commissioners may be exercised by secretaries, assistant secretaries, etc.) for paragraphs (b) and (c) there shall be substituted the following paragraph:—

and at the end of that subsection there shall be added the words “ and any statement signed by one or more of the Commissioners certifying that a person specified in the statement was, at a time or for a purpose so specified, acting under the authority of the Commissioners shall be admissible in evidence, and in Scotland shall be sufficient evidence, of the fact so certified. ”