"Subject to section 77, where evidence which was not submitted to the adjudicator is relied upon in an application for leave to appeal, the Tribunal shall not be required to consider that evidence in deciding whether to grant leave to appeal, unless it is satisfied that there were good reasons why it was not submitted to the adjudicator."
"If an applicant seeks to rely on any evidence which was not submitted to the adjudicator, he must include in his application a full explanation of why that evidence was not so submitted. The Tribunal will not in deciding whether to grant leave to appeal consider any such evidence unless satisfied that there are good reasons why it was not submitted to the adjudicator (Rule 18(11)). A decision by an appellant or his representative (for whatever reason) not to submit the evidence will not normally be regarded as a good reason for not having submitted it. Similarly, if the evidence existed and could by taking reasonable steps have been submitted, the Tribunal is unlikely to decide that there was a good reason for not submitting it. If no explanation is given, the Tribunal will almost certainly not take the evidence into consideration."