18(1)If a claim is made under this Part of this Schedule by any person in a capacity other than that of personal representative or trustee—
(a)paragraph 17 above shall have effect in his case as if for the words " in the same capacity as that in which he makes the claim" there were substituted the words " otherwise than in the capacity of personal representative or trustee " , and
(b)no account shall be taken under that paragraph of any qualifying investments purchased by him unless they are of the same description as one of the qualifying investments to which the claim relates.
(2)For the purposes of this paragraph and the following paragraphs, two investments, not being investments in an authorised unit trust or common investment fund, shall not be treated as of the same description if they are separately quoted on a recognised stock exchange, and an investment in one authorised unit trust or common investment fund shall not be treated as of the same description as an investment in another authorised unit trust or common investment fund.