Morden was a district on the southern edge of London.
To the north-west of Morden was Wimbledon and to the north-east was Brixton. (TV: Revenge of the Slitheen)
Around the 2000s, the London branch of Coldfire Construction, which was secretly operated by the Slitheen, built a technology block in a Morden 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, she called UNIT so they would clear up the Coldfire sites across the world. (TV: Revenge of the Slitheen)