I couldn't say for sure whether there's been a fish kill. The colouration is throughout the depth of the water for sure. The water is still holds this colouration down to Cheadle Bridge (I have not ventured further than this though). The streamer weed seems to have collected quite a bit of this discharge.
I'm kicking myself now as I should have phoned the EA too today

.
I've not seen any rises downstream of the outflow, but in saying that I've seen very few above it too.
My planned trip out over the weekend has had some of the sheen knocked off it. I reckon it'd be a struggle with the conditions as they have been, but this certainly won't help whatsoever.
I'll try and have a mooch round over the weekend and see if there are any casualties...