‘(5) If the appellant makes a minor error in complying with the requirement under rule 3(1) to submit relevant documents to the Appeal Tribunal, and rectifies that error (on a request from the Appeal Tribunal or otherwise), the time prescribed for the institution of an appeal under rule 3 may be extended if it is considered just to do so having regard to all the circumstances, including the manner in which, and the timeliness with which, the error has been rectified and any prejudice to any respondent.’