Leopold Road in south London became a conservation area because of "the cohesiveness of the height of the buildings" but that is threatened by "loss of historic features, inappropriate shop fronts and the dominating presence of traffic".
The hoaxer, who had an accent said to be from the Castletown area of Sunderland, sent police three letters and an audio tape at the height of the Yorkshire Ripper inquiry in 1978 and 1979.