(1) Schedule 4 to the Principal Act (as amended by section 3(1) of the Act of 2006) is amended by substituting the Parts set out in Schedule 2 for Parts 1 to 3 of the said Schedule 4.

(2) This section comes into operation -

(a) in so far as it relates to jobseeker's allowance, pre-retirement allowance and farm assist, on 26 December 2007,

(b) in so far as it relates to supplementary welfare allowance, on 31 December 2007,

(c) in so far as it relates to disability allowance, on 2 January 2008,

(d) in so far as it relates to one-parent family payment (other than where payable in respect of a widow or widower), carer's allowance and a payment referred to in paragraph (b) or (c) of the definition of "relevant payment" in section 178 of the Principal Act, on 3 January 2008, and

(e) in so far as it relates to State pension (non-contributory), blind pension, widow's (non-contributory) pension, widower's (non-contributory) pension, one-parent family payment payable in respect of a widow or widower and guardian's payment (non-contributory), on 4 January 2008.