“If applications for extensions of time are allowed to develop into disputes about the merits of the substantive appeal, they will occupy a great deal of time and lead to the parties’ incurring substantial costs. In most cases the merits of the appeal will have little to do with whether it is appropriate to grant an extension of time. Only in those cases where the court can see without much investigation that the grounds of appeal are either very strong or very weak will the merits have a significant part to play when it comes to balancing the various factors that have to be considered at stage three of the process. In most cases the court should decline to embark on an investigation of the merits and firmly discourage argument directed to them.”
"We accept HMRC's general point that, in most cases, when the FTT is considering an application for permission to make a late appeal, failings by a litigant's advisers should be regarded as failings of the litigant … Therefore, in most cases, a litigant seeking permission to make a late appeal on the grounds that previous advisers were deficient will face an uphill task and should expect to provide a full account of exchanges and communications with those advisers. It will often be impossible to give the requisite full account without waiving privilege." [49] 20. The UT stated in [54] that "when considering applications for permission to make a late appeal, failures by a litigant's adviser should generally be treated as failures by the litigant"