Mount Stuart Square
From Tardis Wiki, the free Doctor Who reference
When Ianto Jones commented on Baps' missing door, Kathy said that she had last seen it in Mount Stuart Square. (AUDIO: Template:Vd)
Behind the scenes
Cardiff's Mount Stuart Square, with its street sign visible, appears as a London street and location of a police station, situated to the left of the Bute Dock Hotel, which Sally Sparrow visits in Blink [+]Loading...["Blink (TV story)"]. Partially visible is a post box which, though not evident in Blink, bears the royal cypher of King Edward VII.