Solved this one.
Maker is Kathryn Roberts, based in Brecon, Wales.
I might well take it along next time I go as I know where her shop is (wanted to go in last time but as Brecon is closed most of the week, I missed out) If you do ever want to go to Brecon (it is lovely), I recommend not going on a Monday or Tuesday as most shops, etc are shut. Many are shut on Wednesday too. Lots of confused tourists wandering about!