I add my thanks for the great pics, for it is I (whirlwind's brother in Oz) who is beefing up the account of our mother's journey for family record purposes with a bit of historical bling! The aircraft looks to have been an Empire Short S23 Mk 1 and enthusiasts may be interested in the 1/10 scale flying model built in Queensland described at this site:
http://www.airwaveyachts.com.au/Aircraft/Index.html
The photo of the boat on Hinze dam looks disconcertingly real. And so do some of the antics that the builder has put the model thru.
Now, all I need to find out is the name of the actual flying boat my mother flew in...( dep Lagos 1/9/41 arr Cairo 5 days later, flown by a Capt Bellin)
andy