This section applies where—
This section applies only if, at the time when the original taxpayer obtained the benefit of the relief, the concession was one available generally to any person falling within its terms.
If the benefit obtained for the first chargeable period by the original taxpayer is repudiated for any later chargeable period (whether by the original taxpayer or by another person), the enactments relating to the taxation of chargeable gains shall have effect as if a chargeable gain equal to the amount of that benefit accrued in the later chargeable period to the person repudiating the benefit.
For the purposes of this section—
Where, without applying a specific enactment, any concession has the effect that—
that concession shall be assumed for the purposes of this section to have involved the application, to a case to which it would not otherwise have applied, of the provisions of an enactment to the corresponding effect.
For the purposes of this section the benefit of any relief obtained by the original taxpayer for the first chargeable period is repudiated by a person for a later chargeable period if—
For the purposes of this section an amount of the benefit of a capital gains relief is recouped from any person in a chargeable period to the extent that an amount is so brought into account in his case for that period as to secure that—
Where—
that person's rights subsequently to amend, appeal against or otherwise challenge any assessment shall not be exercised in any manner inconsistent with his acceptance of that matter (which shall be irrevocable).
In this section "concession" includes any practice, interpretation or other statement in the nature of a concession.