Section 30 of the Principal Act is amended -

(a) by the substitution for subsection (4) of the following subsection:

"(4) Subject to subsections (5) and (6), the appropriate contributions shall be the contributions paid by or in respect of the member concerned for the purposes of long service benefit from -

(a) in the case of a member who is entitled to a preserved benefit under section 28(2) (a), 1 January 1991 or, if later, the date of the commencement of the relevant employment,

(b) in the case of a member who is entitled to a preserved benefit under section 28(2) (b), the date of the commencement of the relevant employment,

but excluding additional voluntary contributions and any payment representing a transfer of accrued rights from another scheme.";

(b) by the substitution in the proviso to subsection (5) for "the commencement of this Part", in each place where those words occur, of "1 January 1991";

(c) by the substitution in subsection (6) -

(i) for "another scheme" of "another occupational pension scheme"; and

(ii) for "that scheme" of "that occupational pension scheme";

and

(d) by the substitution in the proviso to subsection (6) -