30 Oak Street

30 Oak Street was, according to the address on an envelope Madame Vastra sent to Clara Oswald, the Chiswick home of George Maitland and his children, Artie and Angie. (TV: The Name of the Doctor) Following the death of Mrs Maitland, it was, for at least the years of 2012 and 2013, Clara's home, whilst she acted as a temporary nanny for Maitland's children. (TV: The Bells of Saint John) It was also a place that the Eleventh Doctor frequented, typically on Wednesdays. (TV: Nightmare in Silver)

Behind the scenes
Although the name of the street was not revealed until the series 7 finalé, the house number was clearly visible on the right doorjamb in both day and nighttime exterior shots in Bells.