On Thursday 20 April 1967, filming began on The Evil of the Daleks, the epic finale to Doctor Who’s fourth series. The location was Grim’s Dyke, a Victorian house iHarrow some 11 miles from Television Centre.
“The place was in a really bad state,” recalls production designer Chris Thompson. “There were real issues with the building. There were places that we weren’t allowed to go because it was too dangerous...”