The amount determined under subsection (4) below shall be deducted from the aggregate of the chargeable gains less allowable losses ("the amount of the gain on the old assets").
For the purpose of computing any chargeable gain accruing on the disposal of any new asset—
and if the shares which comprise the new assets are not all of the same class, the apportionment between the shares under paragraph (a) above shall be in accordance with their market values at the time they were acquired by the transferor.
The amount referred to in subsections (2) and (3)(a) above shall not exceed the cost of the new assets but, subject to that, it shall be the fraction—
References in this section to the business, in relation to shares or consideration received in exchange for the business, include references to such assets of the business as are referred to in subsection (l) above.