does this actually exist in mainland UK?
For a given definition of ‘wild’ – Yes.
The definition I prefer is no obvious encroachment from development/man made structures etc.
Personally though I can forgive the sight of a distant windfarm from a Cairngorm summit. Where I think ‘wild’ land should be protected is when we get to the point where you can’t walk or camp anywhere without being within spitting distance of a turbine/dam/access road/etc. etc.
Thankfully I think we are a long way from that point yet and despite my inner NIMBY kicking up a fuss I try to be pragmatic about wind farms.
(although having said that, I do worry that windfarms are being developed where they suit private landowners best, not where they would actually serve the population best, surely we should be developing the Campsies and the Ochils before remotest Sutherland?)