I don't think I've been up Tattershall Castle since I was about nine years old. All I remember is that it was a long haul up the spiral staircases and there were parts of the roof either reinforced by scaffolding poles or blocked off by scaffolding poles. I hope it's in a much better state now, because it stands out magnificently against the Big Sky and deserves to be preserved.
Ah, shit, I've just googled it. It looks like the old gravel quarries have been turned into plastic holiday attractions, which will no doubt improve the view from the Castle immeasurably.