Britain is in talks with China over giving Beijing’s state-owned railway-builder a role in constructing the troubled HS2 high-speed link. The China Railway Construction Corporation (CRCC) has said it can build the line in just five years at a much lower cost than is currently forecast, according to the Financial Times.

Department for Transport (DfT) officials confirmed “preliminary discussions” had taken place between CCRC and HS2 Ltd, but said no “concrete commitments” had been made. “The DfT is always keen to learn from the experience of others and to consider approaches that offer value for money to the taxpayer,” one official said.

Boris Johnson this week controversially gave the green light for the scheme to go ahead – despite an official review warning costs could reach over £100bn, against a budget of £62bn. Under current plans the final stretch of the line is not due to be completed until 2040, although Johnson has said he wants that brought forward to 2035.

However, the FT reported that CCRC had written to HS2 Ltd’s chief executive last month saying it could build the line by the middle of the decade, for a much-reduced price tag. The letter, first reported by Building Magazine and seen by the FT, states: “We are certain that we can offer a cost that is significantly lower than the projections we have seen. The advantages are too great, in our opinion, too great to dismiss on the basis that there are obstacles to overcome. You will find that the Chinese way is to seek solutions, not linger on obstacles and difficulties.”

CCRC has transformed China’s transport system, building most of the country’s 15,500-mile high-speed network. However, British officials are said to be sceptical that it could operate in the same way in a democracy with property rights, protected landscapes and powerful lobbying groups.

Any move to give Beijing a further role in the UK’s infrastructure would almost certainly prove controversial, after Johnson reportedly incurred the wrath of US president Donald Trump – as well as upsetting many Tory MPs – with his decision to allow tech giant Huawei to supply equipment for the 5G mobile network.

Tom Tugendhat, the chair of the Commons foreign affairs committee, said allowing the CRCC to build HS2 would be “extremely questionable”.

He told BBC Radio 4’s Today programme: “We are in dire need of a proper China strategy. We are being offered, at extraordinarily generous terms it appears, everything to connect our telephone networks, to connect our cities and to connect our power networks.

“What is it that we want out of China? Have we decided to take back control from Brussels just to hand it over to Beijing? The idea that we should allow others to act like we did in places like India and Nigeria for the best part of 200 years here in the UK would be extremely questionable.”

He also questioned CRCC’s claim it could build the entire line in just five years.

“The reason why Chinese projects in China are very often so quick is because they don’t worry about such minor matters as planning consent or workers’ rights,” he said.

“It seems extremely unlikely that without really short-cutting any number of labour conditions that it would be possible.”