(1) In this section -
"relevant heritage property" means any one or more of the following -
(a) objects to which section 55 of the Principal Act applies;
(b) a house or garden referred to in section 39 of the Finance Act, 1978;
"private company" has the meaning assigned to it by section 16 of the Principal Act;
"subsidiary" has the meaning assigned to it by section 155 of the Companies Act, 1963.
(2) Where a gift or inheritance consists in whole or in part -
(a) at the date of the gift or at the date of the inheritance, and
(b) at the valuation date,
of one or more shares in a private company which (after the taking of the gift or inheritance) is, on the date of the gift or on the date of the inheritance, a company controlled by the donee or successor within the meaning of section 16 of the Principal Act, then each such share shall, to the extent that its market value for tax purposes is, at the valuation date, attributable to relevant heritage property, be exempt from tax and the valu
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