“[18]…The scope of [unreasonable conduct] has been discussed in this Tribunal in Catana[2012] UKUT 172 (TCC) where Judge Bishopp, at [14], described it as covering: ‘cases in which an appellant has unreasonably brought an appeal which he should know could not succeed, a respondent has unreasonably resisted an obviously meritorious appeal, or either party has acted unreasonably in the course of proceedings, for example by persistently failing to comply with the rules and directions to the prejudice of the other side’ [19] The costs ‘incidental to the proceedings’ cover only those costs incurred in the course of preparing and pursuing the appeal…, and, on an application by the appellant, it is only the reasonableness of HMRC’s conduct in defending or conducting the proceedings that falls to be considered. The reasonableness of the original decision against which the appeal has been made is not directly in point, but is relevant to the question whether it was reasonable of HMRC to defend, or to continue to defend, the appeal. [20] Even if the tribunal is satisfied that a party has acted unreasonably in the terms of rule 10, the tribunal nevertheless has a discretion whether or not to make a costs order, or as regards the extent of a costs order. Such a discretion, like any other discretion conferred on the tribunal, must be exercised judicially.”
“ The element of discretion in rule 13(1)(b) 27 When considering the rule 13(1)(b) power attention should first focus on the permissive and conditional language in which it is framed: “the Tribunal may make an order in respect of costs only ... if a person has acted unreasonably....”
“…one small gloss to the above summary, namely that …questions of reasonableness should be assessed by reference to the facts and circumstances at the time or times of the acts (or omissions) in question, and not with the benefit of hindsight”