Thanks martin , they are only 10 mins up the road from me.
Any idea Offhand what i would expect to pay for a cheap powder.
I think most of them (and they seemed to have dozens) were between 30 and 40 quid for a 1lb (454g) bottle.
I think they sold me a more expensive powder than I needed though. I don't know if that's the going rate elsewhere.
It was about 6 months or so ago I was last there.