I'm in Hanley and Fenton so can get to either stretches. I have fished part of the Hanley bit in the past, near Gratwich, a few years ago and knew it had plenty of chub in it. In fact I used to go fly-fishing for them and used to catch plenty on dry fly. Good fun and you could literally work through a shoal.
I didn't know that it was Staffordshires cleanest river! Not much competition I suppose
It looks to be quite shallow below the mill, as Kev says above, but it has some pools and gravel bottomed sections. SO I would ahve thought that grayling would do OK in it in this area. I suppose there's only one way to find out.
The Tean! That river does look good where it runs alongside the road near the Cock Inn at Stramshall. I'm sure it's been mentioned on here before and I think I know who by! I'll PM him.