Hi Claire, I'm not from the UK, but the guys that run Supadupa are. You will get mixed responses about sales on that site, only because it's an independent website that you have to do all the promoting. It's alot of hard work. Some are doing far better than their shop on Etsy, while others aren't fairing well at all.
The point is... it depends on how much work you put into it whether sales will come. My sales are sporadic there, but I have not put the time and work needed "yet".
