"The Commissioners first contention was that in the present circumstances this was not an Appeal before the Tribunal at all. There was no overpayment, the Appellant paid for the licences she asked for and paid the correct amount. It so happened that she applied and paid for more licences than she actually required. In such circumstances the licences could be surrendered and a refund of the unexpired portion made. There was no overpayment of duty because the correct sum was paid for the licence requested. The fact that the Appellant did not need a licence she requested or rather did not need all of them at all times, does not mean that there was an overpayment. No duty was payable unless and until the Appellant sought to purchase a licence. If no Appeal lies in the present circumstances under section 137A the application would require to be dismissed. I am not in this case, however, required to take a narrow or strict view of section 137A because there is no obligation on the Commissioners to repay any licence unless it is surrendered, and that surrender has to be made during its currency. Although it is not necessary to decide in the matter in this case, I would regard it as an unduly narrow view of 137A, so to construe it as to exclude any genuine mistake. It will not do, however, to come along at a later stage and say "