Intended for birders and nature-watchers of all levels of experience, this A5 paperback costs £12, which I reckon is pretty good value, considering it has over fifty full-colour photos and loads of maps! It also has a tickable list of all the birds that have occurred in the Yare Valley, from Marlingford down to Gorleston and directions and access details to dozens of hotspots.
It can be bought on Amazon, from me by e-mail, EBay or from a number of other outlets including Jarrold's and Waterstone's. I'll also have a few copies in the car when I'm out and about!
If this when sells enough to suggest a demand, companion volumes on the Wensum, Bure, Thurne & Ant will follow!