West Croydon Dental Practice, 7 Derby Road
Accessibility: Two steps to get in. Some of the consulting rooms are up one or two narrow flights of stairs.
According to a photo on Flickr, it's been there since at least February 2009.
Existence last checked in January 2017.
OS X co-ord: 532083 OS Y co-ord: 166030 (Latitude: 51.377964 Longitude: -0.103566)