“...but it seems to me that it was conduct of a sort that a small trader was entitled to expect would not happen. It is not something that can be regarded as a normal hazard...If he had brought pressure to bear on the Council he would probably have received no further orders and the bulk of his livelihood would have disappeared. It seems to me, therefore, that this is one of those rare cases where the taxpayer may legitimately put forward as the reason why he should be excused the unexpected and continuing conduct of the person...”