But last week the firm announced that its depot in Totnes, Devon, would be closed, because it was unable to expand and modernise the site in Station Yard.

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The island has had a varied career over the years, serving as a convict stockade, explosives store, police station, boat yard and film set.

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Of the 19 gross misconduct cases, Scotland Yard said nine callers had immediately phoned another operator or subsequently went to a police station.

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