“If, on an appeal notified to the tribunal, the tribunal decides (a) that, the appellant is overcharged by a self-assessment; (b) …; or (c) that the appellant is overcharged by an assessment other than a self-assessment, the assessment or amounts shall be reduced accordingly, but otherwise the assessment or statement shall stand good.”
“An appeal under this Part of this Schedule shall be treated in the same way as an appeal against an assessment to the tax concerned (including…about determination of the appeal by the First-tier Tribunal….).”