As anticipated, there wasn't much to note in terms of locations in ep 303 Goblin's Gold, as the episode centred in the castle, and used the Chateau and the sets in Cardiff. However, Geoffrey's library was seriously extended, so I'm sure he was happy about that!
Similarly, ep 304 Gwaine was also centred in the castle, and again made use of the Chateau and the sets in Cardiff.
There are two things worth noting, however!
♦ The exterior of the Hog's Head Tavern seems to have been constructed around a small tower and 'ruined' walls standing below the Chateau, as seen in ep 102 Valiant when Arthur was teaching Merlin how to fight. I assume this was a 'folly' constructed by Viollet-le-Duc when he was rebuilding the Chateau. (Am I the only person who keeps spelling his name as 'du Lac'...? Probably not!) You can see a photo of the dressed location in the blog of Paul Cripps, the production designer,
here.
The interior of the tavern, however, was a set in Cardiff - probably Arthur's bedroom, redressed (which Angel might consider justice, as Bradley had a good laugh about how the set for Gwen's home is also used as various pub interiors).
♦ When the two bad guys go to collect their enchanted swords and crystals from Cylferth (an old English name apparently meaning 'sacrificial cauldron'), the establishing shot of his home is of Cosmeston Medieval Village. It's considerably darker than when we saw it stand in for Ealdor, and I'm assuming it's not meant to be the same place, but is simply standing in as a generic medieval village.
This shot is from the wrong angle but it shows the unusual conically-shaped pig hut. The shot they used in ep 304 was taken from across the field, near where Merlin and Will talk, while Merlin is supposed to be chopping wood.
Again, the interior of Cylferth's home is a set! You can see images of it
here and
here in Paul Cripps' blog.
I hope you found that of interest! :-)
Screencaps courtesy of
wherethewind.