s 8 Meaning of “instrument”.
(1) Subject to subsection (2) below, in this Part of this Act “ instrument ” means— (a) any document, whether of a formal or informal character; (b) any stamp issued or sold by a postal operator ; (c) any Inland Revenue stamp; and (d) any disc, tape, sound track or other device on or in which information is recorded or stored by mechanical, electronic or other means. (2) A currency note within the meaning of Part II of this Act is not an instrument for the purposes of this Part of this Act. (3) A mark denoting payment of postage which the a postal operator authorises to be used instead of an adhesive stamp is to be treated for the purposes of this Part of this Act as if it were a stamp issued by the postal operator concerned . (3A) In this section “postal operator” has the meaning given by section 27 of the Postal Services Act 2011 . (4) In this Part of this Act “ Inland Revenue stamp ” means a stamp as defined in section 27 of the Stamp Duties Management Act 1891.