Theresa May will allow Huawei to build key parts of the UK's new 5G network, reports have claimed – despite fears the company will allow the Chinese government to spy on people using it.

The government is said to be satisfied that the company will only be allowed to build "non-core" parts of the infrastructure, such as antennas, keeping the information passed over it safe.

Digital minister Margot James has dismissed reports that a final decision has been made, saying "in spite of Cabinet leaks to the contrary, final decision yet to be made on managing threats to telecoms infrastructure."

Politicians including Tom Tugendhat, the Conservative chairman of Britain's Foreign Affairs Committee, criticised the reported decision, suggesting that it will make internet users in the UK unsafe.

There is no clear way of deciding whether a part of the infrastructure is "core", he said, because of the way the network is built.

"It still raises concerns," he told BBC Radio 4. "The definition of core and non-core is a very difficult one with 5G.

"5G does change from a faster internet system into an internet system that can genuinely connect everything, and therefore the distinction between non-core and core is much harder to make."

Inside Huawei's new campus for workers in China Show all 20 1 /20 Inside Huawei's new campus for workers in China Inside Huawei's new campus for workers in China An employee enters a train in the Huawei's Ox Horn campus at Songshan Lake in Dongguan Reuters Inside Huawei's new campus for workers in China A worker cleans a waterway as office buildings are seen at Huawei's new Ox Horn Research and Development campus in Dongguan, near shenzen Getty Inside Huawei's new campus for workers in China An area of Huawei's Ox Horn campus modelled after Cesky Krumlov in Czech Republic Getty Inside Huawei's new campus for workers in China The real Cesky Krumlov in Czech Republic Getty Inside Huawei's new campus for workers in China Employees sleep in their cubicle in the research and development area after lunch at the Bantian campus in Shenzhen Getty Inside Huawei's new campus for workers in China An area of Huawei's Ox Horn campus modelled after Heidelberg in Germany Getty Images Inside Huawei's new campus for workers in China Employees play basketball on a court within the staff housing complex at the end of the workday at the Bantian campus in Shenzhen Getty Inside Huawei's new campus for workers in China A replica of the Karl Theodor Bridge in Huawei's Ox Horn campus Getty Inside Huawei's new campus for workers in China The real Karl Theodor Bridge in Heidelberg, Germany Getty Inside Huawei's new campus for workers in China Huawei's Ox Horn campus at Songshan Lake in Dongguan Reuters Inside Huawei's new campus for workers in China Employees ride the bus home at the end of the workday from the company's Bantian campus in Shenzhen Getty Inside Huawei's new campus for workers in China Huawei workers eat their subsidised lunch in one of many large cafeterias at the company's Bantian campus in Shenzhen Getty Inside Huawei's new campus for workers in China Reception staff walk in front of a large screen showcasing different technologies in the foyer of a building used for high profile customer visits at the campus in Shenzen Getty Inside Huawei's new campus for workers in China An employee reads in the staff library on a break at the company's Bantian campus in Shenzhen Getty Inside Huawei's new campus for workers in China An area of Huawei's new Ox Horn campus modelled after a European City Getty Inside Huawei's new campus for workers in China Servers are seen inside Huawei's factory campus in Dongguan Reuters Inside Huawei's new campus for workers in China The conductor waits for a train in the Huawei's Ox Horn campus at Songshan Lake in Dongguan Reuters Inside Huawei's new campus for workers in China A general view shows the research and development centre at Huawei's Ox Horn campus AFP/Getty Inside Huawei's new campus for workers in China Employees works on a mobile phone production line at Huawei's factory campus in Dongguan Reuters Inside Huawei's new campus for workers in China An office building on the Huawei campus in Dongguan AFP/Getty

A number of ministers, including home secretary Sajid Javid, foreign secretary Jeremy Hunt, defence secretary Gavin Williamson, international trade secretary Liam Fox and international development secretary Penny Mordaunt were said to have raised concerns about the decision, according to The Daily Telegraph.

The decision comes after a number of senior security figures warned publicly of the risks entailed in allowing a Chinese firm access to the UK's critical communications network.

MI6 chief Alex Younger has said Britain needs to decide how "comfortable" it is in allowing Chinese firms to become involved while the head of GCHQ Jeremy Fleming has spoken of both "opportunities and threats" which they present.

Some critics have expressed concerns that the Chinese government could require the firm to install technological "back doors" to enable it spy on or disable Britain's communications network.

Last month a government-led committee set up to vet Huawei's products said it had found "significant technological issues" with its engineering processes leading to new risks to the UK network.

The decision is likely to further strain relations with the US, which has banned Huawei from government networks and urged others in the Five Eyes intelligence alliance - the UK, Australia, New Zealand and Canada - to do the same.

Huawei has denied having ties to the Chinese government, but critics question how independent any large Chinese company can be, as they are legally obliged to co-operate with state intelligence agencies.

A Department for Digital, Culture, Media and Sport spokeswoman said the security and resilience of the UK's telecoms networks was of "paramount importance".

"As part of our plans to provide world class digital connectivity, including 5G, we have conducted a review of the supply chain to ensure a diverse and secure supply base, now and into the future," the spokeswoman said.

"This is a thorough review into a complex area and will report with its conclusions in due course."

Downing Street refused to comment on the report, which was first published in the Telegraph. A spokeswoman said: "We don't comment on NSC discussions."