“The relevant words of paragraph 3 ( a ) of the rules applicable to Cases I and II — ‘wholly and exclusively laid out or expended for the purposes of the profession’ — appear straightforward enough. It is conceded that the first adverb — ‘wholly’ — is in reference to the quantum of the money expended and has no relevance to the present case. The sole question is whether the expenditure in question was ‘exclusively’ laid out for business purposes, that is: What was the motive or object on the mind of the two individuals responsible for the activities in question? It is well established that the question is one of fact: and again, therefore, the problem seems simple enough. The difficulty however arises, as we think, from the nature of the activity in question. Entertaining involves inevitably the characteristic of hospitality. Giving to charity or subscribing to a staff pension fund involves inevitably the object of benefaction. An undertaking to guarantee to a limited amount a national exhibition involves inevitably supporting that exhibition and the purposes for which it has been organised. But the question in all such cases is: was the entertaining, the charitable subscription, the guarantee, undertaken solely for the purposes of business, that is, solely with the object of promoting the business or its profit earning capacity? “It is, as we have said, a question of fact. And it is quite clear that the purpose must be the sole purpose. The paragraph says so in clear terms. If the activity be undertaken with the object both of promoting business and also with some other purpose, for example, with the object of indulging an independent wish of entertaining a friend or stranger or of supporting a charitable or benevolent object, then the paragraph is not satisfied though in the mind of the actor the business motive may predominate. For the statute so prescribes. Per contra , if in truth the sole object is business promotion, the expenditure is not disqualified because the nature of the activity necessarily involves some other result, or the attainment or furtherance of some other objective, since the latter result or objective is necessarily inherent in the act.”