It's a Siter (I can spell, and I know my Indonesian Gamelan from Classical Indian Ragas). It is much plainer than the Wikipedia one. As far as piano wire suppliers are concerned, it was despair at the lack of suppliers of small gauge wire via Google that led to the request on here.
It occurred to me that Guitar sting makers must buy this stuff by the mile, and thought that maybe somebody might know a string maker.
I'll check out smetals- I have not tried them, though I have been in touch with four of five other suppliers. Either they don't stock the small sizes, or they have a minimum order of 100metres.
Thanks anyway
Dave