Great story, thanks Crax.@rich p I just remembered us talking about that castle near Abergele.
http://www.castlewales.com/gwrych.html
It is a folly but was a proper bona fide livable folly, now sadly derelict.
Edit: out of date website. It has been restored now, or is being.
http://www.bbc.co.uk/news/uk-wales-33556349
While I'm here, I may as well post up a few more pix