Downham is a suburban district located in south east London, with parts inside of the London Borough of Lewisham. It is located north of Bromley.Downham was named in honour of Lord Downham, who was chairman of the London County Council between 1919-20.The Prime Meridian passes just to the west of Downham.Downham is one of the only Inner London districts that doesn't fall under a London Postcode.