Margam Castle, a Victorian "mock" castle built in 1830, is no stranger to paranormal TV, since Most Haunted visited it in their 2006 series. From the pictures available on the Wikipedia entry, Margam is a subtly gorgeous site, with an astonishing color palette. Appropriately, it was the site of one of the first photographs taken in Wales, although that probably didn't do the colors much justice, much like the black-and-white shots we're going to see.
The guide for the walkthrough is a smiling bald man named Geraint Hopkins, founder of Ghost Watch Wales, who has been visiting Margam for years and is firmly convinced that the place is haunted. All of Hopkins' dialogue is subtitled, even though he is certainly as easy to understand as Barry. A search on Hopkins' name shows that he is an ophidiological, as well as paranormal, enthusiast: he owns an African rock python named Socrates. It's too bad that Hopkins didn't bring Socrates to assist the GHI team in their investigation. I'm sure they would have benefited from its wisdom.
The haunting symptoms are the usual mixed bag, with an unusual addition– red and green flashing lights in the tapestry room, plus bright white lights that leave trails. Yolande Rees-Hopkins, Geraint's wife, saw an apparition that she recognized as that of the original owner, Christopher Rice Mansel Talbot, and another eyewitness heard (and felt) a "white lady" in the Yellow Room. Ghostly monks have been seen outside, and during World War II, US troops under Eisenhower's command were stationed at the house, and complained of seeing phantoms.
More on GHI: Margam Castle