What do you want to do with it? All depends on that. Also does it need new windows, roof, damp proof, heating, electrics, septic tank or drains?. And would you want to do everything that’s in the planning permission mentioned (that seems to cover outbuildings etc too).
I think if you’re working with what’s there between £1-200,000. If you’re knocking walks down, moving things round and sorting the outbuildings at least £300,000.
It is a beautiful house but it’s not going to be cheap and I think you could potentially exceed the ceiling price if you’re not careful (if you care about that sort of thing).