Johnson (The Edge of Destruction)
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Johnson (The Edge of Destruction), as per the name she is given in her sole appearance in the intro ofThe Edge of Destruction novelisation.
Talk about it here.
Miss Johnson (PROSE: The Edge of Destruction) was the school secretary at Coal Hill School in 1963.
Over the five months Susan Foreman spent at the school, Miss Johnson frequently asked her for documentation to prove her identity. Her efforts to find this evidence included two letters sent to Susan's grandfather. (PROSE: The Edge of Destruction)
She told Barbara Wright that Susan Foreman's address was 76 Totter's Lane. (TV: An Unearthly Child)