"The crucial question on this appeal is whether it is a breach of the term of loyalty for an employee whilst still in the employment of his employer to indicate an intention to set up in competition with the employer in the future. The employers and the industrial tribunal have assumed that it is. In our view, the tribunal fell into error in accepting that the indication of such intention was in itself sufficient.
"This court .... would regard it as a wholly insufficient reason to dismiss a man, that he was merely seeking employment with a competitor, unless it could be shown that there were reasonably solid grounds for supposing that he was doing so in order to abuse his confidential position and information with his present employers. In the nature of things, when a man changes employment, it is more than likely he will be seeking fresh employment with someone in the same line of business and, therefore, a competitor of his present employers."