The Communication Workers Union (CWU) claims the taxpayer has lost out in the Government's haste to sell-off Royal Mail as the company has been "flogged on the cheap for no good reason."
CWU general secretary Billy Hayes, continued:
It was flourishing in public ownership, could have accessed private capital in public ownership - as many other companies do - and could have continued to provide a high service in public ownership.
Instead it has been thrown an uncertain future based on profit margins not services.
A roaring first day's trading in Royal Mail shares has seen Government accused of undervaluing the company before its stock market launch.
Royal Mail shares will be priced at 330p when it makes its stock market debut, valuing the group at £3.3 billion, the Government announced.