Detective Chief Inspector April Casburn has been jailed for 15 months at the Old Bailey after being found guilty of misconduct in public office for offering to sell information to the News of the World
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John Cantlie, who worked for a number of Fleet Street newspapers, is thought to have been taken hostage in November 2012.
The union published a 'no show' league table for last year the worst offenders for cancellations.
Zalkalns was jailed in his native Latvia for eight years in 1988 after he admitted killing his wife with a piece of electrical equipment.