Sydenham was a suburban district of London. Gallows Gate Road was located there.
Residents of Number 1, Gallows Gate Road included Robert Mann, Mrs Mann, Major Wooley, Clive Plympton, M. Sillington, Miss Gibbs, and Bertha Baxter. The Tenth Doctor also lived there for one day in 1940. (PROSE: Number 1, Gallows Gate Road)
The Crystal Palace was located in Sydenham. (AUDIO: A Spoonful of Mayhem)