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“Hugh” Filming Locations

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Traitors episode “Hugh” was filmed in Cardiff & London in the United Kingdom.

Main Building (Cardiff University) as House of Commons

The Reform Club as Lobby

Glamorgan Building (Cardiff University) as Her Majesty's Revenue and Customs (interior)

Her Majesty's Treasury & Revenue and Customs as Her Majesty's Revenue and Customs (exterior)

Cathays Park as Park

Source: IMDb