http://www.rivererewashfoundation.co.uk/home

Jim , you may find these guys helpful.
The big nasty UK flyfish forum has a long Erewash thread .

As to the Wye area for grayling do take into account the water can be up and down ,next week looks damp so watch the Wye Usk Foundation river cams
http://www.wyeuskfoundation.org/conditi ... 011debfcdd
Guess for you the Ryader one is the best .
My main interest in the Wye is for Salmon down on the below Monmouth beats so I watch all of the cams as down the bottom we get all the water .
If going a bit further do consider the Monnow system , some lovely more managable water especially with a 7.6 rod .Some of its on the WUF passport tickets .