The Department confirmed that as well as agreeing a revised cost for the programme with HS2 Ltd, there will also be challenge from HM Treasury before a revised budget for the programme can be set. It told us that HM Treasury is already closely engaged and an important step in determining the eventual cost of the programme will be the upcoming spending review. As part of that, the Department will need to agree with the Treasury what the funding profile for the programme will be for the remainder of this Parliament.25