" Form and contents of application notice 17. - (1) An application notice for permission to appeal must be in the appropriate prescribed form and must … (2) … state all the grounds of appeal and give reasons in support of those grounds. (3) The grounds of appeal must – (a) identify the alleged errors of law in the adjudicator's determination; and (b) explain why such errors made a material difference to the decision… Variation of grounds of appeal 20. - (1) A party may vary his grounds of appeal only with the permission of the Tribunal. (2) Where the Tribunal has refused permission to appeal on any ground, it must not grant permission to vary the grounds of appeal to include that ground unless it is satisfied that, because of special circumstances, it would be unjust not to allow the variation."