The Government pressed ahead with "an unnecessary and botched fire sale of Royal Mail," the shadow trade minister said.
Ian Murray said as a result of this, taxpayers "have been short changed by hundreds of millions of pounds while the Government's 'priority' City investors made a killing at the public's expense."
Mr Murray said: "The cross-party committee's damning report reinforces the significant criticisms which have already been made by the National Audit Office and others.
"David Cameron's Government still has serious questions to answer."
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The Duke of Cambridge also laid a wreath to honour the victims before kick-off.
The mother of one of the Manchester attack victims has told of the distressing moment she found her daughter being treated after the attack.
Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".