Superb series, Ann.
As for re-introducing animal species to Scotland, some re-introductions have already taken place - beaver and white-tailed eagle to name just two - but these things have to be very carefully thought through. There are always unplanned consequences to such actions, and the individuals who want further re-introductions here - wolf, lynx and even wolverine - are, I believe, deeply mistaken. Large predators were hunted out in Scotland many centuries ago and this has created one great benefit - there are no dangerous animals in the Scottish countryside and consequently our remaining forests, moorland and mountain wildernesses can be wandered and enjoyed without fear or extra precautions. Of course I don't advocate the extermination of predators elsewhere just to create "safe" environments for hikers, but in Scotland we are where we are, and a new equilibrium amongst our remaining wild species was established a very long time ago.
Once when walking a jungle trail alone, in Nepal, I heard a tiger - that unmistakable gutteral, coughing grunting vocalisation - and on a trail in Zion Canyon, in the USA, I came across a warning notice stating that there had been lion attacks, and what to do if attacked by a mountain lion. Both experiences were deeply unpleasant.