Chesham

Chesham as seen on a map of England. (TV: Daleks' Invasion Earth 2150 A.D. ^[+]Loading...["Daleks' Invasion Earth 2150 A.D. (theatrical film)"])

Chesham was a town to the north west of London.

To the south-west of Chesham was Amersham roughly south-east was Ruislip. (TV: Revenge of the Slitheen)

In the 2000s, the London branch of Coldfire Construction, which was secretly operated by the Slitheen, built a technology block in a Chesham school, using it as a transducer to absorb energy from the Sun and destroy the Earth so they could sell it off. After Sarah Jane Smith foiled the Slitheen at Park Vale Comprehensive School, Ealing, she called UNIT so they would clear up the Coldfire sites across the world. (TV: Revenge of the Slitheen)