Article 27 Applying for permission to appeal
Subject to paragraph (2), an application to the Tribunal under this Part must be made by filing with the appellate authority an application notice for permission to appeal.
A person who is in detention under the Immigration Acts may apply for permission to appeal either—
in accordance with paragraph (1); or
by serving an application notice on the person having custody of him.
Where an application notice is served in accordance with paragraph (2)(b), the person having custody of the applicant must endorse on the notice the date that it is served on him and forward it to the appellate authority.
As soon as practicable after an application notice for permission to appeal is filed, the appellate authority must notify the other party to the appeal to the Tribunal that it has been filed.