(1) Schedule 4 to the Principal Act (as amended by section 11 of the Act of 2009) is amended by substituting the Parts set out in Schedule 2 for Parts 1 and 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 30 December 2009,

(b) in so far as it relates to supplementary welfare allowance, on 4 January 2010,

(c) in so far as it relates to disability allowance, on 6 January 2010,

(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 7 January 2010, 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 8 January 2010.