"... an employer having prima facie grounds to dismiss for one of [the reasons set out ins.57 of the Employment Protection (Consolidation) Act 1978 ] will in the great majority of cases not act reasonably in treating the reason as a sufficient reason for dismissal unless and until he ha taken the steps, conveniently classified in most of the authorities as 'procedural,' which are necessary in the circumstances of the case to justify that course of action. ... in the case of redundancy, the employer will normally not act reasonably unless he warns and consults any employees affected or their representative, adopts a fair basis on which to select for redundancy and takes such steps as may be reasonable to avoid or minimise redundancy by redeployment within his own organisation. If an employer has failed to take the appropriate procedural steps in any particular case, the one question the industrial tribunal is not permitted to ask in applying the test of reasonableness posed by section 57(3) is the hypothetical question whether it would have made any difference to the outcome if the appropriate procedural steps had been taken. On the true construction of section 57(3) this question is simply irrelevant. It is quite a different matter if the tribunal is able to conclude that the employer himself, at the time of dismissal, acted reasonably in taking the view that, in the exceptional circumstances of the particular case, the procedural steps normally appropriate would have been futile, could not have altered the decision to dismiss and therefore could be dispensed with. In such a case the test of reasonableness under section 57(3) may be satisfied.
"First, as was pointed out by Browne-Wilkinson J. in Sillifant 's case, if the industrial tribunal, in considering whether the employer who has omitted to take the appropriate procedural steps acted reasonably or unreasonably in treating his reason as a sufficient reason for dismissal, poses for itself the hypothetical question whether the result would have been any different if the appropriate procedural steps had been taken, it can only answer that question on a balance of probabilities. Accordingly, applying the British Labour Pump principle, if the answer is that it probably would have made no difference, the employee's unfair dismissal claim fails. But if the likely effect of taking the appropriate procedural steps is only considered, as it should be, at the stage of assessing compensation, the position is quite different. In that situation, as Browne-Wilkinson J. put in Sillifant 's case, at p. 96:
'There is no need for an "all or nothing" decision. If the industrial tribunal thinks there is a doubt whether or not the employee would have been dismissed, this element can be reflected by reducing the normal amount of compensation by a percentage representing the chance that the employee would still have lost his employment.'