Where any qualifying investments comprised in a person's estate immediately before his death are—
cancelled within the period of twelve months immediately following the date of the death without being replaced by other shares or securities, and
held, immediately before cancellation, by the appropriate person,
they shall be treated for the purposes of this Chapter as having been sold by the appropriate person for a nominal consideration (one pound) immediately before cancellation.
Where any qualifying investments are included in the calculation under section 179(1) above by virtue of this section, paragraph (b) of that subsection shall have effect, so far as relating to those investments, with the omission of the words from "or" to the end.