"The first question is whether what happened was capable in law of frustrating the contract; the second is whether it did frustrate it: this is a question of fact: see Pioneer Shipping Ltd v B.T.P. Tioxide Ltd [1982] A.C. 724, 752, per Lord Roskill."
"It is very important, and sometimes difficult, to remember that where a right of appeal is confined to questions of law, the appellate tribunal must loyally accept the findings of fact with which it is presented and where as can happen from time to time it is convinced that it would have reached a different conclusion of fact, it must resist the strong temptation to treat what are in truth findings of fact as findings of law or mixed findings of fact and law. The correct approach involves a recognition that Parliament has constituted the Industrial Tribunal the only tribunal of facts and that conclusions of fact must be accepted unless it is apparent that on the evidence no reasonable tribunal could have reached them. If such be the case and happily it is a rarity the tribunal which is assumed to be a reasonable tribunal must have misdirected itself in law and the Employment Appeal Tribunal will be entitled to intervene."