Yes, a very interesting topic! I assume you are wanting opinions. As a generalisation, conservationists are all for beavers repopulating Britain's rivers, many land owners are against it.
Britain has huge problems with flooding - beavers can't cure all those problems, but given time and support they can help solve many. Beavers adjust the landscape in such a way that they slow down the water flow of rivers and streams, because they prefer slow water to live in. To the casual observer, this seems to cause flooding, but only in areas where agriculture has taken over from old water meadows, or removed trees from watercourse edges. Beavers make their dams and food stores by coppicing trees such as willow and alder; the result may look chaotic at first but the trees soon regrow and form an even denser area, which slows water and allows it to be absorbed into the ground, or join a watercourse but slowly.
Some farmers want to cultivate every square inch of their land, right down to the water's edge, and right up to their fences. This encourages flooding as water is made to flow fast over the land surface, carrying away soil and not allowing plants and trees to take root. By giving up a small area for remodelling by beavers, the results in flood prevention, both on the farmer's own land and for people living in towns and villages downstream, are surely worth the investment?
Add to that the fact that by returning small areas to wetlands, which is effectively what the beavers are doing, native trees and flowers along with their insect, amphibian and bird populations will return to areas which are currently wildlife deserts.
I think beavers are wonderful creatures - if only we had a stream on our land