True, it could be British. In fact, the address for the publisher on the back does look British.
There was a good amount of stuff going back to at least the '50s that was printed in the UK and distributed in Australia as well. (thumbs u
It's British for sure. The thing I cannot figure is that the GCD for this title/publisher has only two issues (of 18) listed.
Here's a link to one of the partially indexed "Lassie's" - Number 2. Note that it has the same cover as your #6, just a little different colouring.
What I find hard to figure is the earlier book (#2) is priced at 8d. This one (#6) is priced at 6d.
2d less for the later book.
One possibility is the page count dropped. I note the #8 has a cover blurb announcing 28pp. Nothing on the earlier one (and GCD is of no use here).
GCD is pathetically lacking in information on foreign books. They do have some stuff but there's no cross reference for issue content or titles. There's a few foreign hosted sites that have done a much nicer job of that than GCD.
Sorry guys, it's a slow and steady process but I am working on indexing and uploading scans for as many titles as I can I've done some great work so far.