"We would agree with Phillips J's statement that there may be conduct so intolerable that it amounts to a repudiation of contract. There are threads then running through the authorities whether it is the implied obligation of mutual trust and confidence, whether it is that intolerable conduct may terminate a contract, or whether it is that the conduct is so unreasonable that it goes beyond the limits of the contract. But in each case, in our view, you have to look at the conduct of the party whose behaviour is challenged and determine whether it is such that its effect, judged reasonably and sensibly, is to disable the other party from properly carrying out his or her obligations. If it is so found that that is the result, then it may be that a Tribunal could find a repudiation of contract."
"What matters is whether the decision under appeal was a permissible option. To answer that question in the negative in the context of employment law, the appeal tribunal will almost always have to be able to identify a finding of fact which was unsupported by any evidence or a clear self-misdirection in law by the industrial tribunal. If it cannot do this, it should re-examine with the greatest care its preliminary conclusion that the decision under appeal was not a permissible option and has to be characterised as 'perverse'."