2In the case of a conviction involving sentence of death—
(a)the sentence shall not in any case be executed until after the expiration of the time for giving notice of appeal or of application for leave to appeal under the said section 16; and
(b)if notice is so given, the appeal or application shall be heard and determined with as much expedition as practicable, and the sentence shall not be executed until after the determination of the appeal or, in a case where an application for leave to appeal is finally refused, of the application.