“(15) Where in the case of a conveyance or transfer on sale or in the case of a conveyance or transfer operating as a voluntary disposition inter vivos the instrument contains a certificate by the party to whom the property is being conveyed or transferred to the effect that the person becoming entitled to the entire beneficial interest in the property (or, where more than one person becomes entitled to a beneficial interest in the property, each of them) is related to the person or each of the persons immediately theretofore entitled to the entire beneficial interest in the property in one or other of the following ways, that is, as a lineal descendant, parent, grandparent, step-parent, husband or wife, brother or sister of a parent or brother or sister, or lineal descendant of a parent, husband or
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wife or brother or sister
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a duty of an amount equal to one-half of the ad valorem stamp duty which, but for the provisions of this paragraph, would be chargeable under this heading but where the calculation results in an amount which is not a multiple of £1 the amount so calculated shall be rounded up to the nearest £.”,
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