The opposite is happening, there's a large amount of publicity about the release but not much useful information or help to those who will be affected.
I would have thought it essential to inform landowners if you expect them to severely restrict grey squirrel control, with the inevitable loss of trees, in order to establish martens.
Well, here, at least, local landowners and many others have been consulted and management agreed. So I'd assume its the same elsewhere.
I doubt they just let them go any old where without solid monitoring and agreement from landowners, etc. After all, round here, pheasant shooting is a major economic consideration after tourism. So I wouldn't be too concerned.
To be honest, this time of year, pheasants can be a real danger on the rural roads, and I've had twenty in my garden all at once last week, as the were escaping the guns, less than a mile away from me. My grass is covered in little bird gifts. Nasty!
Grey squirrels have also destroyed yet another bird feeder.
I'd rather have pine martins!!