There is a very strong likelihood that the iris pictured is COPATONIC a 1994 introduction of Barry Blyth Australia's truly International Iris breeder. It can be purchased from his Tempo Two Nursery in Victoria, Australia

Here is a link that might be useful: HERITAGE IRISES

Thanks for your reply nzirishunter. I've emailed Barry and hope he can provide me with some. Reading his webpage http://www.tempotwo.com.au/ it seems they may be retiring soon, but hopefully not too soon!

Hi traceyc you could also try Yarrabee Iris gardens in SA

Here is a link that might be useful: Yarrabee Iris Gardens

Thanks again nzirishunter.

I heard back from Tempo Two and am thrilled that your identification was correct and that I can purchase Copatonic through them.

I also received their catalogue...all I can say is that I can see why you iris fanatics become so entranced by them! I've always loved them but not until I received this catalogue did I realise I could become obsessed by them!