St James's Place
From Tardis Wiki, the free Doctor Who reference
Clarendon House, where Tanya Adeola lived, was located on St James's Place in London. It was located within the bounds of the postal area E8 5LG. (TV: Nightvisiting)
Behind the scenes
The given postal code would place St James's Place in Hackney, which is no surprise, as she walks down a street in Hackney in For Tonight We Might Die, and Coal Hill Academy, in Shoreditch, is therefore also located in Hackney.