Thanks terry w. Bookmarked that one.
I used
KANTHAL A wire
They appear to be more expensive than terry w's link, but I didn't have any problems with them. They may be useful if you want a second choice.
I got my Koh Gen Do here:
Koh Gen Do Organic Cotton 80 sheets for Skin Care: Amazon.co.uk: Beauty
It doesn't come in a box, but so far as I can see it's authentic. The pads look right and the label is printed on the bag. It also vapes very well, much better than cotton wool balls.