"9. At the meeting on 1 September Mr Hughes asked if the alternative job offer was still on the table. The respondents said that it was and a written copy of the offer dated1 September 1993 was produced. Mr Hughes then asked if pay protection would apply and he was told that it would not. Mr Hughes and the applicant then conferred together and in their evidence to us they both accept that the choice confronting the applicant was either to take a redundancy payment or to accept the new job. The applicant decided to accept the new job."
"I believe I state the rule of the Court correctly when I say that where a given matter becomes the subject of litigation in, and of adjudication by, a Court of competent jurisdiction, the Court requires the parties to that litigation to bring forward the whole case, and will not (except under special circumstances) permit the same parties to open the same subject of litigation in respect of matter which might have been brought forward as part of the subject in context, but which was not brought forward, only because they have, from negligence, inadvertance, or even accident, omitted part of their case. A plea of res judicata applies, except in special cases, not only to points upon which the court was actually required by the parties to form an opinion and pronounce a judgment, but to every point which properly belonged to the subject of litigation and which the parties, exercising reasonable diligence, might have brought forward at the time."
"The first relates to those points which were actually decided by the Court; this is res judicata in the strict sense. Secondly, those which might have been brought forward at the time but were not. The second is not a true case of res judicata but rather is founded on the principle of public policy in preventing multiplicity of actions, it being in the public interest that there should be an end to litigation."
"..... In my opinion your Lordships should affirm it to be the law that there may be an exception to issue estoppel in the special circumstance that there has become available to a party further material relevant to the correct determination of a point involved in the earlier proceedings, whether or not that point was specifically raised and decided, being material which could not by reasonable diligence have been adduced in those proceedings. One of the purposes of estoppel being to work justice between the parties, it is open to courts to recognise that in special circumstances inflexible application of it may have the opposite result, as was observed by Lord Upjohn in the passage which I have quoted above from his speech in the Carl Zeiss case [1967] 1 A.C. 853,.947."
"An estoppel which has come to be known as 'issue estoppel' may arise where a plea of res judicata could not be established because the causes of action are not the same.
"..... The second is not a true case of res judicata but rather is founded upon the principle of public policy in preventing multiplicity of actions, it being in the public interest that these should be an end to litigation; the court will stay or strike out the subsequent action as an abuse of process: see per Lord Wilberforce in Brisbane City Council v A-G for Queensland[1979] AC 411 ."
"On the documentation put before me and on the arguments addressed to me, it seems clear that the Applicant accepted his job on terms that pay protection did not apply. That also seems to have been expressly decided by the Industrial Tribunal sitting in Sheffield in the Applicant's previous case. I therefore conclude that the Applicant's Wages Act claim has no reasonable prospect of success."