Lambeth was a London district. The Eighth Doctor detected anachronistic technology around Fetiman's Road in Lambeth. He journeyed there with Penny Chapman and found it was a proto-morphic lifeform, hidden in Blackthorne Gasworks. (DWM: The Curious Tale of Spring-Heeled Jack)
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The Eighth Doctor points out Fetiman's Road on a map of Lambeth. (DWM: The Curious Tale of Spring-Heeled Jack)