Hi paradise2431

Welcome to Rootschat!! I've split your enquiry off and made it into a new topic on our Photo Restoration and Dating board.
Apart from the obvious details about individual photographers (for which there are a few books that can help) the general principles of dating photos in the UK and Australia are pretty much the same, so you can post some of your pictures here (each on a separate topic) for help as well as using the links in the topic you originally posted on.
I'll have another look at your two pics and try to work out a date for you.
Prue