D the G I think we can say that not all old industrial sites can be treated in the same way.

Very true, some have become major tourist attractions.
Mynyyd Sygin
Lechwydd Slate quarry
Morwellham Quay
Big Pit to name but a few.

We need a few more Fred Dibnahs to select and help preserve various buildings and artifacts from our industrial past. Some more industrial museums would not go amiss, it would be a tragedy to totally lose the physical reminders of that heritage.
A link for those the other side of the pond:
Fred Dibnah
https://www.youtube.com/watch?v=etna1lEnsYo