Ratty's Return?

It's interesting to note that there will be an attempt to reintroduce Ratty (the Water vole) to the Holnicote Estate on Exmoor some 30 years after it was eradicated from the park (https://www.theguardian.com/environment/2018/sep/11/water-voles-returning-to-national-park-in-west-country-after-30-years). The reintroduction, at 6 locations, will involve about 150 animals and is intended to be carefully monitored. It is, however, difficult to preclude Water vole killers such as mink and domestic cats from such an area, so it remains to be seen whether the attempt will or will not turn out to be successful (especially as it is reportedly the UKs most rapidly declining Mammal).