The State Library of Queensland identifies this image as 'R.A.A.F. Mosquito bombers, ca. 1945'; I suspect it's from a RAAF march and flypast put on for the Third Victory Loan in the centre of Brisbane on 6 April 1945. On that occasion, according to the Courier-Mail,
The veteran Lancaster bomber 'G. for George,' will lead planes flying over the city during the march. They will include 6 Liberators, 15 Beaufighters, 9 Mosquitoes, 12 Beauforts, 6 Spitfires, and 3 Kittyhawks.
Either way, it's a nice bit of aerial theatre.