“There is to be a tribunal, known as the First-tier Tribunal, for the purposes of exercising the functions conferred on it under or by virtue of this Act or any other Act.”
“(6) If, on an appeal notified to the tribunal, the tribunal decides: (a) that … the appellant is overcharged by self-assessment; … (c) that the appellant is overcharged by an assessment other than a self-assessment, The assessment or amount shall be reduced accordingly, but otherwise the assessment or statement shall stand good. … (10) Where an appeal is notified to the tribunal, the decision of the tribunal on the appeal is final and conclusive. (11) But subsection (10) is subject to … (b) Tribunal Procedure Rules.”