The chief executive of High Speed 2, Alison Munro, has dismissed the claim that the rail project will cost £80 billion - more than double the official estimate - as "absurd".
She told ITV News that she "doesn't recognise" the figure allegedly quoted in a report by the Institute of Economic Affairs, and that she is confident the cost will not overrun.
More top news
Daughter whose mother was left for hours on a hospital trolley in A&E has campaigned tirelessly for change - and with some success.
After unseasonably windy weather with gales and big battering waves along exposed western coastal spots, a little calmer into tomorrow.
Sinkhole causes two lanes to collapse but luckily no injuries have been reported.