Quist is concerned by the fact that, approximately every one hundred years, certain extreme weather conditions arise which lead to an increase in the water level of the Thames - and just one inch higher would result in the whole of London flooding. Even more disturbing is the fact that this increase is imminent.
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This episode was wiped by the BBC at some point before the corporation audited its archives in 1978. There is currently no known copy of this edition in existence. See more