Of interest is the fact that they all ran on the white clay. The one heavily grogged clay pot didn't have any runs at all on it. Which makes me wonder if the white clay body had a flux that reacted with the ingredients in the glaze to make it run a little more than usual. Could be a combination of both I suppose.
I must make a note of that for the next batch of glaze that needs to be made. Along with all the "extras" I've put in that weren't in the original recipe. I'm sure there's a note somewhere......just got to find it!