I think perhaps that David is referring to a certain radio series Random radio jottings: Flying Doctor calling Wallamboola base
“"Flying Doctor calling Wallamboola base" became something of a catchphrase for anyone listening to the BBC Light Programme series that ran from 1958 to 1963.” Aha! I was a little confused because unlike Wallamboola, Wollumboola is a real place not far from the Jervis Bay Navy Base. 1958 was a bit before my time sorry gents, but this old Tilley wouldn’t be out of place on an RFDS base. I’ve been to the one at Dubbo - we’ll worth a visit if you’re ever in the area!!!