There are two areas in London with this name
One is a locality in the London Borough of Bromley, bordered by the London Borough of Lewisham to the north. It is within the Bromley post town and the BR postcode area. The Wikipedia page is [1]
The other is a district and urban area in the London Borough of Newham in east London immediately south of West Ham. It forms the majority of the London E13 postcode district. The Wikipedia page is [2]