(1) The Third Schedule to the Principal Act is hereby amended by the substitution for Rule 1A (inserted by section 35 of the Act of 1990 and in this section referred to as the "existing Rule") of the following Rule:
(1) Notwithstanding the provisions of this Schedule, for the purposes of old age pension, the gross proceeds derived from the sale of the principal residence of the claimant or pensioner, or, in the case of a married couple who are living together, the spouse of the claimant or pensioner where such spouse has attained pensionable age, shall not, subject -
(a) to such limit,
(b) to such conditions,
(c) in such circumstances, and
(d) for such periods,
as shall be prescribed, be taken into account in calculating the means of the claimant or pensioner.
(2) Notwithstanding the provisions of this Schedule, for the purposes of -
(a) widow's (non-contributory) pension,
(b) deserted wife's allowance,
(c) prisoner's wife's allowance, or
(d) lone parent's allowance,
where th