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The man in charge of HS2鈥檚 Euston station has rubbished suggestions that scrapping the scheme鈥檚 London terminus would save time and money, as the transport secretary confirms the project鈥檚 cost has skyrocketed.

Speaking to 好色先生TV, HS2鈥檚 Euston programme director Rob Carr said ending the line at Old Oak Common rather than Euston would add years to the schedule and cause a potential multibillion-pound hit to the scheme鈥檚 overall business case.

It comes as details of a review carried out by HS2 chairman Allan Cook were made public. 

In a written statement transport secretary Grant Shapps has revealed Cook believes the scheme cannot be delivered within its 拢56bn budget and is instead likely to cost between 拢72bn and 拢78bn at 2015 prices.

Shapps said that adjusting for construction cost inflation, the range set out in Cook鈥檚 report is equivalent to between 拢81bn and 拢88bn in 2019 prices, against a budget of 拢62.4bn.

He also revealed that Cook did not believe the project鈥檚 first phase could open by 2026.

Shapps said: 鈥淗e [Cook] recommends 2028 to 2031 for phase one 鈥� with a staged opening, starting with services between London Old Oak Common and Birmingham Curzon Street, followed by services to and from London Euston.鈥�

He said Cook expected phase 2b, the full high-speed line to Manchester and Leeds, to open between 2035 and 2040. The current opening date for the full line is 2033.

Terminating the line at Old Oak Common in west London, rather than Euston is also one of the options being considered in the review of the project being led by Douglas Oakervee, who has already visited the Euston site.

But Carr said: 鈥淵ou鈥檇 have to redesign Old Oak Common station. That鈥檚 at least a two-year hit in design terms. 

鈥淓ven if you could build the redesigned station, imagine 18 trains each with 1,000 people getting off and getting on the Crossrail trains, which haven鈥檛 been designed for that. It would be madness.

鈥淲e are talking billions potentially in terms of [the] business case impact of delaying London to Birmingham because we had to redesign the station at Old Oak Common.鈥�

Carr said the 11 HS2 platforms at Euston allowed it to act as a 鈥減ressure valve鈥� for the line, saying if Old Oak Common, which only has six, replaced it as the capital鈥檚 terminus, it would either have to be redesigned or the number of services halved.

He said the potential to redesign Old Oak Common was further limited by the fact the station platforms are 20m deep and sandwiched between the Greater Western mainline and the Crossrail depot.

Carr also pointed to the wider implications of cancelling the 拢1.5bn scheme at Euston, which is set to be built by a team made of Mace and Spanish firm Dragados.

He said: 鈥淵ou鈥檇 then forego the huge development value, 拢3bn-拢4bn, the 1,700 homes, the 19,000 jobs that you would generate.鈥�

Carr also revealed the team at Euston 鈥� made up of design firm Arup, which is on a design-to-cost contract, and the Mace/Dragados JV 鈥� was working on plans to build the HS2 station in one phase.

Current plans would involve the station鈥檚 first six platforms being built in Stage A and the remaining five subsequently built as Stage B1. The redevelopment of the Network Rail station would be Stage B2.

He said: 鈥淭he current plan is we build Stage A, then Network Rail demolish the station for a year or two years and then we build Stage B1. That鈥檚 got to be inefficient doesn鈥檛 it?

鈥淲e are starting to question some of the High Speed Two requirements to see what we can flex to build a station perhaps slightly smaller but still deliver the same service. That鈥檚 the challenge we are going through right now.鈥�