“in cases of this sort there is no single path to a correct decision. An approach which suits the facts and arguments in one case maybe unhelpful in another. I agree with the view expressed by Mummery J in the present case, at page 944D of the report way he says; “in order to decide whether a person carries on business on his own account it is necessary to consider many different aspects of that person’s work activity. This is not a mechanical exercise of running through items on a checklist to see whether they present in, or absent from, a given situation. The object of the exercise is to paint a picture from the accumulation of detail. The overall effect can only be appreciated by standing back from the detailed picture which has been painted, by viewing it from a distance and by making an informed, considered, qualitative appreciation of the whole. It is a matter of the evaluation of the overall effect of the detail, which is not necessarily the same as a sum total of the individual details. Not all details are equal weight or important in any given situation. The details may also vary in importance from one situation to another.”