The recovery of the European beaver seems to be accelerating, with many planned reintroductions across many counties within the UK.
Dorset, Derbyshire, Hampshire and the Isle of Wight, Nottinghamshire and Montgomeryshire all have reintroduction plans. Should all these go well, and the various established populations continue to grow, the beavers are likely to spread throughout the whole of the UK within just a few decades.
Given that they are a keystone species, their appearance usually has multiple benefits, from greatly improved water quality to increased biodiversity and higher water table (leading to less flooding). There is also often an increase in tourism around areas that wildlife of this sort can be seen regularly.