(1) In this section,
"the period of ownership" -
(a) where the individual has had different interests at different times, shall be taken to begin from the first acquisition taken into account in determining the expenditure which under the Capital Gains Tax Acts is allowable as a deduction in computing the amount of the gain to which this section applies, and
(b) for the purposes of subsections (3) to (5), shall not include any period before the 6th day of April, 1974.
(2) This section shall apply to a gain accruing to an individual on the disposal of or of an interest in -
(a) a dwelling house or part of a dwelling house which is or has been occupied by the individual as his or her only or main residence, or
(b) land which the individual has for his or her own occupation and enjoyment with that residence as its garden or grounds up to an area (exclusive of the site of the dwelling house) not exceeding one acre;
but, where part of the land occupied with a residence is and part is not wi
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