Thanks to Catarina for the the following.
Matt Mitovich wrote that there will be a masquerade ball in Chuck's 4x16 in a british manor. I suppose it has something to do with the new Vivian character, who is supposed to be an Oxford student and daughter of a criminal mastermind.
"@jemjoven The location we're at is doubling for a British manor. It's a masquerade party (Ep 16) where we meet Robin Givens' character."
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