“45(1) Liability to a penalty under paragraph 39 or 40 does not arise if the person satisfies HMRC or (on an appeal notified to the tribunal) the tribunal that there is a reasonable excuse for the failure or the obstruction of an officer of Revenue and Customs. 45(2) For the purposes of this paragraph– (a)an insufficiency of funds is not a reasonable excuse unless attributable to events outside the person's control, (b)where the person relies on any other person to do anything, that is not a reasonable excuse unless the first person took reasonable care to avoid the failure or obstruction, and (c)where the person had a reasonable excuse for the failure or obstruction but the excuse has ceased, the person is to be treated as having continued to have the excuse if the failure is remedied, or the obstruction stops, without unreasonable delay after the excuse ceased.”
“where the person had a reasonable excuse for the failure or obstruction but the excuse has ceased, the person is to be treated as having continued to have the excuse if the failure is remedied, or the obstruction stops, without unreasonable delay after the excuse ceased”
“47(1) A person may appeal against any of the following decisions of an officer of Revenue and Customs– (a) a decision that a penalty is payable by that person under paragraph 39, 40 or 40A, or (b) a decision as to the amount of such a penalty. 47(2) But sub-paragraph (1)(b) does not give a right of appeal against the amount of an increased daily penalty payable as a result of paragraph 49A. … 48(3) On an appeal under paragraph 47(1)(a) that is notified to the tribunal, the tribunal may confirm or cancel the decision. 48(4) On an appeal under paragraph 47(1)(b) that is notified to the tribunal, the tribunal may– (a) confirm the decision, or (b) substitute for the decision another decision that the officer of Revenue and Customs had power to make.”