For the purposes of this Part a person is taken to be interested in shares if a body corporate is interested in them and—
the body or its directors are accustomed to act in accordance with his directions or instructions, or
he is entitled to exercise or control the exercise of one-third or more of the voting power at general meetings of the body.
For the purposes of this section a person is treated as entitled to exercise or control the exercise of voting power if—
another body corporate is entitled to exercise or control the exercise of that voting power, and
he is entitled to exercise or control the exercise of one-third or more of the voting power at general meetings of that body corporate.
For the purposes of this section a person is treated as entitled to exercise or control the exercise of voting power if—
he has a right (whether or not subject to conditions) the exercise of which would make him so entitled, or
he is under an obligation (whether or not subject to conditions) the fulfilment of which would make him so entitled.