(1) Where -
(a) a person having contracted for the purchase of any property, but not having obtained a conveyance of that property, contracts to sell the same to any other person, and
(b) the property is in consequence conveyed immediately to the sub-purchaser,
then the conveyance shall be charged with ad valorem duty in respect of the consideration moving from the sub-purchaser.
(2) Where -
(a) a person having contracted for the purchase of any property but not having obtained a conveyance contracts to sell the whole, or any part or parts of that property, to any other person or persons, and
(b) the property is in consequence conveyed by the original seller to different persons in parts or parcels,
then the conveyance of each part or parcel shall be charged with ad valorem duty in respect only of the consideration moving from the sub-purchaser of such part or parcel, without regard to the amount or value of the original consideration.
(3) Where -
(a) a sub-purchaser takes an actual co
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