Sam is given messages by the girl off Test Card F, who comes out of the television with her clown doll. At the end of the series, she can also be seen running down the street and switching off the television from the inside. (Ashes to Ashes (2008) also refers to her with the clown motif.) The real life Test Card girl, Carole Hersee is estimated to have been on British television for 70,000 hours, equivalent to nearly eight years, and so is in the "Guinness Book of World Records" for the longest television appearance in history.

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