“…..Such decisions are, essentially, challengeable only on what loosely may be called Wednesbury grounds, when the court at first instance exercised the discretion under a mistake of law, or disregard of principle, or under a misapprehension as to the facts, where they took into account irrelevant matters or failed to take into account relevant matters, or where the conclusion reached was “outside the generous ambit within which a reasonable disagreement is possible”
“44. In my opinion this is amendment application which falls to be dealt with under Cocking and Selkent principles. I do not accept that it would be a misdirection in law for me to apply the unvarnished principles set out in Cocking and Gillick to an equal pay claim, indeed those principles are binding on me. I do accept that the nature of equal pay claims, in particular the strict six month time limit with no provision for extension and the six year backdating period, are relevant factors to take into account, and that they are weighty factors, both as regards the impact on the claimants if the amendment is not allowed, and as regards the impact on House 21 Ltd if it is.”