(1) Schedule 4 to the Principal Act is amended by substituting the Parts set out in Schedule 2 to this Act for Parts 1 to 5 of the said Schedule 4.

(2) This section comes into operation -

(a) in so far as it relates to unemployment assistance, pre-retirement allowance and farm assist, on 28 December 2005,

(b) in so far as it relates to supplementary welfare allowance, on 2 January 2006,

(c) in so far as it relates to disability allowance, on 4 January 2006,

(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 5 January 2006, and

(e) in so far as it relates to old age (non-contributory) pension, 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 orphan's (non-contributory) pension, on 6 January 2006.