"(1) A party who wants to appeal to the High Court must serve an appeal notice ..... " and it sets out upon whom that notice should be served. At Part 17.20 it provides: "(1) An appeal notice constitutes — (a) an application to the High Court for permission to appeal to that court; and (b) an appeal to that court, if the court gives permission."
"(1) A party on whom an appellant serves an appeal notice under rule 17.19 may serve a respondent's notice, and must do so if - (a) that party wants to make representations to the High Court; or (b) the court so directs."