“A useful summary of the principles governing the exercise of the ‘just and equitable’ discretion was set out by Mrs Justice Elisabeth Laing (as she then was) in Miller and ors v Ministry of Justice and ors and another case EAT 0003/15: • the discretion to extend time is a wide one • time limits are to be observed strictly in employment tribunals. There is no presumption that time will be extended unless it cannot be justified. The reverse is true: the exercise of discretion is the exception rather than the rule • if a tribunal directs itself correctly in law, the EAT can only interfere if the decision is, in the technical sense, ‘perverse’, i.e. no reasonable tribunal properly directing itself in law could have reached it, or the tribunal failed to take into account relevant factors, or took into account irrelevant factors, or made a decision which was not based on the evidence • what factors are relevant to the exercise of the discretion, and how they should be balanced, are a matter for the tribunal. The prejudice that a respondent will suffer from facing a claim which would otherwise be time-barred is customarily relevant in such cases. • the tribunal may find the checklist of factors inS.33 of the Limitation Act 1980 helpful (see ‘Relevant factors’ below) but this is not a requirement, and a tribunal will only err in law if it omits something significant.”