Sector SE14 Delta was the Department's designation for an otherwise unnamed museum in London.
Among its exhibits were a virtual reality simulation of Sherwood Forest and Major Oak, the last living oak tree. In 2050, K9, Starkey and Jorjie Turner visited the museum at the same time that a Centuripede stole Major Oak. The theft was investigated by the Department and by K9's team, who discovered that the Centuripede was using it to build a pod for her eggs. (TV: The Last Oak Tree)