"4. We referred ourselves to various cases and in particular to the phrase `substantial equity' inSection 57(3) of the Employment Protection (Consolidation) Act 1978 and the leading case of Post Office v Fennell[1981] IRLR 221 . We were however influenced by the case of AEI Cables Ltd v McLay[1980] IRLR 84 which states that `in cases of gross misconduct it will not be a factor of any or any significant weight where gross misconduct is concerned' and it was clear that this was a case of gross misconduct. The Applicant was therefore justified in complaining that either the employer should have dismissed them both or he should have taken some lesser action against them both but he could not be equitable between them if he treated them differently. In those circumstances although the Applicant's conduct merited dismissal it was unfair to dismiss him whilst not dismissing his colleague.
"... Although an employee's length of service - the remaining reason given by the Industrial Tribunal for finding the dismissal unfair - is a relevant consideration in many cases, it would be wholly unreasonable to expect an employer who had been deceived by an employee, in the way in which the respondent deceived the appellants in the present case, to have any further confidence in him and to continue him in his employ. The quality of the employee's conduct in the present case was of such gravity that the length of his prior service was of no materiality."
"The Court of Appeal held: