“ (1) The Tribunal may set aside a decision which disposes of proceedings, or part of such a decision, and re-make the decision, or the relevant part of it, if-- (a) the Tribunal considers that it is in the interests of justice to do so; and (b) one or more of the conditions in paragraph (2) is satisfied. (2) The conditions are-- (a) a document relating to the proceedings was not sent to, or was not received at an appropriate time by, a party or a party's representative; (b) a document relating to the proceedings was not sent to the Tribunal at an appropriate time; (c) there has been some other procedural irregularity in the proceedings; or (d) a party, or a party's representative, was not present at a hearing related to the proceedings. (3) A party applying for a decision, or part of a decision, to be set aside under paragraph (1) must make a written application to the Tribunal so that it is received no later than 28 days after the date on which the Tribunal sent notice of the decision to the party. ”
“7. I now explain why these matters are outside the scope of rule 43. This is because that rule is limited to matters of procedure and what the claimant says is a matter of substance. In other words, the rule is concerned with how the Upper Tribunal handled the claimant’s application for permission to appeal. It does not provide a means of challenge to the decision itself or the reasons on which it is based. The points the claimant makes in respect of her self-employment do not relate to how this tribunal dealt with her application. Rather, they challenge the correctness of my decision on the merits of her application. 8. Powers like that conferred by rule 43 have been consistently interpreted as applying only to procedural irregularities and not as including challenges to the substance of the tribunal’s decision or reasons…”
“17. While I agree that the phrase [some other procedural irregularity], by its own terms, invites a wide interpretation, and makes it clear that what appears in paras (a) to (c) does not represent an exhaustive list, it is apparent from the manner in which the conditions are set out that para (d) must be read in its context, and be interpreted consistently with what precedes it. The prior paragraphs provide examples of errors affecting the conduct of a hearing: thus paras (a) and (b) do not relate to a document which a party has omitted to produce because he did not then realise its evidential significance, but which he now, belatedly, wishes to introduce, but to one which was not available to the tribunal, or to one party, because of a transmission error…”