“11 Right to appeal to Upper Tribunal (1) For the purposes of subsection (2), the reference to a right of appeal is to a right to appeal to the Upper Tribunal on any point of law arising from a decision made by the First-tier Tribunal other than an excluded decision. (2) Any party to a case has a right of appeal, subject to subsection (8). (3) That right may be exercised only with permission (or, in Northern Ireland, leave) … 12 Proceedings on appeal to Upper Tribunal (1) Subsection (2) applies if the Upper Tribunal, in deciding an appeal under section 11, finds that the making of the decision concerned involved the making of an error on a point of law. (2) The Upper Tribunal– (a) may (but need not) set aside the decision of the First-tier Tribunal, and (b) if it does, must either– (i) remit the case to the First-tier Tribunal with directions for its reconsideration, or (ii) re-make the decision. …”
“37. Any claim under section 80 of the Act shall be made in writing to the Commissioners and shall, by reference to such documentary evidence as is in the possession of the claimant, state the amount of the claim and the method by which that amount was calculated.”
“(3) Unless each party agrees that it is unnecessary, the decision notice must— … 5 (b) be accompanied by full written findings of fact and reasons for the decision.”