(a) the appellant, within 21 days after the day on which the Registrar has given his or her decision, shall serve a notice in writing, signed by the appellant or his or her attorney-at-law, on the Registrar and the Attorney General, of the appellant's intentions to appeal and of the general grounds of the appeal, and the appellant may apply to the Court within 14 days after the day on which the Registrar has given his or her decision for leave to extend the time within which notice of appeal prescribed by this section may be served, and the Court upon hearing of the application may extend the time prescribed by this section as it thinks fit;