Peter McParlin, chairman of the Prison Officers Association has said that the Ministry of Justice (MoJ) should not have allowed their response to an alleged violent jail incident involving Woolwich murder suspect Michael Adebolajo to "run on for two days".
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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.