The final part of the series where Laurence Llewellyn-Bowen visits some of the finest houses in Wales, stepping back in time to uncover their hidden secrets. Today he's at Plas Talhenbont - a 17th century mansion on the Lleyn Peninsula. It's a house currently owned by an Essex-born family who went in search of the good life in Wales, only to spend a lifetime renovating their dream property.