Section 342A (inserted by section 18 of the Social Welfare and Pensions Act 2011) of the Principal Act is amended -

(a) by the designation of that section as subsection (1),

(b) by the substitution, in subsection (1), of "section 342" for "section 342(1)", and

(c) by the insertion of the following subsection after subsection (1):

"(2) Subsection (1) shall apply to amounts required to be repaid by virtue of -

(a) a revised decision referred to in subsection (1)(a) or (1)(b), or

(b) a revised determination referred to in subsection (1)(c),

given on or after 29 June 2011, whether or not the amount so repayable is in respect of a period commencing before, or on or after, that date.".