A US cousin of mine kindly tracked down a source of Wonder Wire to:
Precision Enterprises Unlimited
PO Box 97
Springfield
VT 05156
Sorry I can't lay my hands on a phone number for you at present. This was last year, and to be honest I haven't tried it out yet, but it looks like very nice stuff, just needing to be cut carefully. As you already know. It's actually 6 thou by the way. How you get on with it, when you last used it?
Mark