In reply to Timmd:
I'd love to see the 'lower' fields flooded in times of heavy rainfall and not just in winter. But having some experience of being involved with landowners whose land was adjacent to a small river in the Peak and their reluctance to give it up for the sake of a few cattle and sheep it would be bloody hard if not impossible to convince potentially hundreds, certainly tens of farmers to allow their land to return to nature. Granted these areas could still be grazed but this will take a generation before it happens.
if it were to happen i can only imagine a lovely crisp winters evening with hundreds and thousands of waders and wildfowl in the winter months but as i say i fear its either a long way off or it wont happen at all.