The expected benefit-cost ratio of the HS2 has been revised down in the Government's latest report, falling from £2.50 benefit for every pound spent to £2.30.
It attributed the revision to a £10 billion increase in the scheme's projected £42.6 billion cost, which was made earlier this year.
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The operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
Police said the incident in Melbourne, Australia, was terror related.