"Where there is no issue raised by sections 58 to 62 the subject matter for the tribunal's consideration is the employer's action in treating the reason as a sufficient reason for dismissing the employee. It is that action and that action only that the tribunal is required to characterise as reasonable or unreasonable. That leaves no scope for the tribunal considering whether, if the employer had acted differently, he might have dismissed the employee. It is what the employer did that is to be judged, not what he might have done. On the other hand, in judging whether what the employer did was reasonable it is right to consider what a reasonable employer would have had in mind at the time he decided to dismiss as the consequence of not consulting or not warning.