"It is plain, we think, that there must exist a principle exemplified by the four cases to which we have referred that where an employee resigns and that resignation is determined upon by him because he prefers to resign rather than be dismissed (the alternative having been expressed to him by the employer in the terms of a threat that if he does not resign he will be dismissed) the mechanics of the resignation do not cause that to be other than a dismissal. The cases do not in terms go further than that. We find the principle to be one of causation. In cases such as that which we have hypothesised and those reported, the causation is the threat. It is the existence of a threat which causes the employee to be willing to sign and to sign a resignation letter or be willing to give and to give the oral resignation. But where that willingness is brought about by other considerations and the actual causation of the resignation is no longer the threat which had been made out but is the state of mind of the resigning employee, that he is willing and content to resign on the terms which he has negotiated and which are satisfactory to him, then we think there is no room for the principle to be derived from the decided cases. In such a case he resigns because he is willing to resign as a result of being offered terms which are to him satisfactory terms on which to resign. He is no longer impelled or compelled by the threat of dismissal to resign, but a new matter has come into history namely that he has been brought into a condition of mind in which the threat is no longer the operative factor of his decision; it has been replaced by the emergence of terms which are satisfactory."
"On the principles laid down in Sheffield v Oxford Controls Ltd we find that the Applicant did not resign his employment because he thought he would be dismissed. There are other factors that caused him to sign the letter. These factors have been listed above [they had set them out at great length] and we find that he voluntarily signed the letter and resigned and therefore there is no dismissal.