This section applies where, at the time when a notice is served on the purchaser under section 11A, 12A, 12B or 12C, he no longer holds the estate or interest that was the subject-matter of the original disposal.
In the case of a notice under section 11A (right to information as to terms of disposal, &c.) the purchaser shall, within the period for complying with that notice—
serve notice on the person specified in the notice as the person to whom particulars are to be provided of the name and address of the person to whom he has disposed of that estate or interest ("the subsequent purchaser"), and
serve on the subsequent purchaser a copy of the notice under section 11A and of the particulars given by him in response to it.
In the case of a notice under section 12A, 12B or 12C the purchaser shall forthwith—
forward the notice to the subsequent purchaser, and
serve on the nominated person notice of the name and address of the subsequent purchaser.
Once the purchaser serves a notice in accordance with subsection (2)(a) or (3)(b), sections 12A to 14 shall, instead of applying to the purchaser, apply to the subsequent purchaser as if he were the transferee under the original disposal.