(1) Section 128 of the Principal Act is amended -
(a) by substituting the following for subsection (6):
(a) Subject to subsection (7), a person shall, in the case of a right granted by reason of the person's office or employment, be chargeable to tax under this section in respect of a gain realised by another person -
(i) if the right was granted to that other person,
(ii) if the other person acquired the right otherwise than by or under an assignment made by means of a bargain at arm's length,
(iii) if the 2 persons are connected persons at the time when the gain is realised, or
(iv) if the person benefits directly or indirectly from the exercise, assignment or release of the right by the other person;
but in a case within subparagraphs (ii), (iii), or (iv), the gain realised shall be treated as reduced by the amount of any gain realised by a previous holder on an assignment of the right.
(b) For the purposes of this subsection, a gain realised by another person shall include a g
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