In reply to The Ice Doctor:
I'm not anti, but far from convinced it is beneficial and many questions I would want answered. I understand it to be a reintroduction to the UK (as a whole) possibly starting in Kielder, so should ultimately be looking on as a countrywide reintroduction, not simply one forest area.
Controlling deer population seems to be a popular plus for them, but when lynx were in the UK there were 2 species of native deer, there are now 6 species. Which will lynx predate, which will even be in their habitat, what densities of lynx are needed to make an impact, will the deer simply sense a predator and move out of Kielder to other areas. If short of food (a population crashes in a prey species), I am far from convinced that a few sheep or anything else available would not be taken.
If lynx breed well, are there connecting corridors to other suitable habitats (as much is made of them avoiding open countryside) without conflict. If the deer population crashes in an area, will there be enough prey for them without upsetting the balance for other dependant predators (fox, raptors, polecats, owls, mustelids etc). Will they kill pine martens which are being reintroduced to areas to hopefully control grey squirrels? As mentioned above, what impact on Scottish wildcats, capercaillie, red squirrels? I can't imagine them making inroads into the red deer population.
I think there are still many, many questions that are glossed over by a general "They are a native species and will control deer, therefore a good thing." Are they going to be a good thing for everything, or turn out to be a very bad thing for another species?