Mr McLoughlin told MPs plans were continuing for an interim contract with Virgin to operate for up to 14 months while the franchise process was rerun.
He said passengers would see the same staff on the same trains and the service would be "enhanced":
In dealing with this, my department has been frank and open about its mistakes and is absolutely determined to find out exactly what happened.
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Temperatures are predicted to reach a high of 23C.
Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.
Top temperature 24C/75F.