Roger Gale from the Post Office said the Communication Workers Union were making "unrealistic" pay demands considering the fact that the company is losing £37 million a year.
The union was asking for a pay increase of three and a half percent last year, and three and a quarter percent this year, which Mr Gale said was "unaffordable."
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The report also said that many graduates do not even see a 'earnings premium' from their years at university.
The country's counter-terrorism forces have regained control of the facility.