Robert Oxley, campaign manager for the Taxpayers' Alliance, believes the Government is "cherry-picking" its figures for HS2 and is creating a "fake boogeyman" by claiming that the alternative - upgrading the current network - would mean years of disruption.
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Celebrities lined up to be photographed with the characters, who famously have antennas on their heads and TV screens on their stomachs.
The Olympic champion released a statement after a newspaper alleged his American coach may have broken anti-doping rules.