Green’s Dictionary of Slang

heavenly plan n.

(Aus.) a man.

1902		Bulletin (Sydney) 18 Jan. 16/3: A heavenly plan with a big charming mottle of O-my-dear sticking out of his sky-rocket.
1945		Baker Aus. Lang.
1951		Sydney Morn. Herald 1 Dec. see 1902 above.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1999		R. Walton ‘Cockney Jack and the Beanstalk’ 🌐 this was his chance to prove to his one or the other that at last he was a heavenly plan and was smart and responsible too.