Those guns were at McDonalds Gunshop in Melbourne, here's the link:

http://www.mcdonaldsgunshop.com.au/

Also, John Saunders who had those Greeners made up still has a web-site:

http://www.centuryarms.com.au/

No offence, Gryph, but my eyes couldn't cope with a shallow vee express sight at the breech. I have a .500/.450 Express double which has the rear sight half-way down the barrel, and that's much better. If I can hit the pig silhouette at 100 yds with a revolver (sight radius 6 inches) I should have no trouble with a much steadier 10-lb rifle! If those Greeners were mine, I'd simply replace the vee with a neat low-profile tube-type ghost-ring peep.