7. Where the IBA have before the transfer date disposed of (or of their interest in) any assets used, throughout the period of ownership, wholly or partly for the purposes of the part of their trade transferred to the nominated company under the principal Act, sections 115 to 119 of the 1979 Act (roll-over relief on replacement of business assets) shall have effect in relation to that disposal as if the IBA and the nominated company were the same person.