"[35] [The court] will take account of the seriousness and significance of the breach (which has been assessed at the first stage) and any explanation (which has been considered at the second stage). The more serious or significant the breach the less likely it is that relief will be granted unless there is good reason for it. Where there is good reason for a serious or significant breach, relief is likely to be granted. Where the breach is not serious or significant, relief is also likely to be granted. [36] But it is always necessary to have regard to all the circumstances of the case. The factors that are relevant will vary from case to case. As has been pointed out in some of the authorities that have followed Mitchell, the promptness of the application will be a relevant circumstance to be weighed in the balance along with all the circumstances. Likewise, other past or current breaches of the rules, practice directions and court orders by the parties may also be taken into account as a relevant circumstance."
“…a Judge should address an application for relief from sanction in three stages, as follows: i) The first stage is to identify and assess the seriousness or significance of the failure to comply with the rules. The focus should be on whether the breach has been serious or significant. If a judge concludes that a breach is not serious or significant, then relief will usually be granted and it will usually be unnecessary to spend much time on the second or third stages; but if the judge decides that the breach is serious or significant, then the second and third stages assume greater importance. ii) The second stage is to consider why the failure occurred, that is to say whether there is a good reason for it. It was stated in Mitchell (at para. [41]) that if there is a good reason for the default, the court will be likely to decide that relief should be granted. The important point made in Denton was that if there is a serious or significant breach and no good reason for the breach, this does not mean that the application for relief will automatically fail. It is necessary in every case to move to the third stage. iii) The third stage is to evaluate all the circumstances of the case, so as to enable the court to deal justly with the application. The two factors specifically mentioned inCPR rule 3.9 are of particular importance and should be given particular weight. They are (a) the need for litigation to be conducted efficiently and at proportionate cost, and (b) the need to enforce compliance with rules, practice directions and court orders…”