This section applies if HMRC give notice of the conclusions of a review (see section 49E(6) and (9)).
The conclusions are to be treated as if they were an agreement in writing under section 54(1) for the settlement of the matter in question.
The appellant may not give notice under section 54(2) (desire to repudiate or resile from agreement) in a case where subsection (2) applies.
Subsection (2) does not apply to the matter in question if, or to the extent that, the appellant notifies the appeal to the tribunal under section 49G.