In reply to sparkythedog:
I am a joint owner of a woodland in the west midlands. While there is little hope of red squirrels repopulating the woods at least in the short term this far south, the number of greys nevertheless should be seriously controlled because they literally kill off trees by ring-barking them. They find sustenance in the cambium layer under tree bark.
Grey squirrels, along with an ever increasing population of grazing deer, means that the wellbeing of woodland and tree regeneration is under very serious threat without drastic interventions.
I hate the needless killing of any animal, but honestly, grey squirrels and deer are an absolute menace if healthy woodland, and the thousands of other species it supports, is the priority.
Speaking as a cynical old git, I reckon if they didn't look so cute there would have been a more concerted effort to control them.