6.—(1) In this paragraph “invested” means invested in one or more designated securities at the mean price.
(2) A designated security is a government security designated for the financial year by the Department after consulting the Government Actuary, and the mean price is half way between the highest and lowest prices shown for it in the Official Daily List of The Stock Exchange for 1st October in the financial year or, if the Exchange was not then open, for the last day on which it had been open.
(3) It shall be assumed that
A + B - C
was invested at the beginning of the financial year—
A being the total of the receipts credited for the financial year in accordance with regulation G2(1) and (4)(b) to (d);
B being the notional interest described in paragraph 5(1)(a), (b) and (c); and
C being the total of the payments debited for the financial year in accordance with regulation G3.
(4) It shall be assumed that
A + B + D - C
is invested at the end of the financial year in the same designated security or securities, A, B and C being the same as in sub-paragraph (3) and D being half the interest that would have accrued for the financial year from the assumed investment described in that sub-paragraph.