“44. When the FTT is considering applications for permission to appeal out of time, therefore, it must be remembered that the starting point is that permission should not be granted unless the FTT is satisfied on balance that it should be. In considering that question, we consider the FTT can usefully follow the three-stage process set out in Denton : (1) Establish the length of the delay. If it was very short (which would, in the absence of unusual circumstances, equate to the breach being ‘neither serious nor significant’), then the FTT ‘is unlikely to need to spend much time on the second and third stages’ – though this should not be taken to mean that applications can be granted for very short delays without even moving on to a consideration of those stages. (2) The reason (or reasons) why the default occurred should be established. (3) The FTT can then move onto its evaluation of ‘all the circumstances of the case’. This will involve a balancing exercise which will essentially assess the merits of the reason(s) given for the delay and the prejudice which would be caused to both parties by granting or refusing permission. 45. That balancing exercise should take into account the particular importance of the need for litigation to be conducted efficiently and at proportionate cost, and for statutory time limits to be respected. By approaching matters in this way, it can readily be seen that, to the extent they are relevant in the circumstances of the particular case, all the factors raised in Aberdeen and Data Select will be covered, without the need to refer back explicitly to those cases and attempt to structure the FTT’s deliberations artificially by reference to those factors. The FTT’s role is to exercise judicial discretion taking account of all relevant factors, not to follow a checklist.”