Chinese technology giant Huawei has said that security problems in a government report can take between three and five years to resolve.
In a letter to Norman Lamb MP, the chairman of the House of Commons science and technology committee, the company promised to spend £ 1.5 billion over five years to address the security issues that had arisen in the past year.
However, the Chinese company warned that the process could take up to five years to see "tangible results".
"Modern communication networks are complex systems that continue to evolve in new and innovative ways, and improving our software engineering capabilities is like replacing components on a high-speed train in motion," said Huawei's career director, Ryan Ding, in the letter.
"It's a complicated and involved process and it will take at least three to five years to see tangible results, and we hope the British government can understand this."
The letter was the answer to the concerns of the Huawei Cyber Security Evaluation Center (HCSEC) in its annual report, a body that includes Huawei, British operators and UK government officials.
It warned that "areas of concern" in Huawei's security infrastructure meant that it could only give "limited assurance" that Huawei's involvement with the UK telecommunication infrastructure did not constitute a national security threat.
The company also denied earlier claims that it could be forced to support Chinese national intelligence work using information collected from the UK.
"Huawei has never used UK hardware, software or information collected in the UK or anywhere else in the world to help other countries collect information, and we would not do this in any country," Mr. Ding said.
"If Huawei were ever guilty of malicious behavior, it would not go unnoticed – and it would certainly destroy our company, it's a matter of security or nothing, there's no third option, we choose security to ensure. "
Ding also defended the company's reputation against several allies in the United Kingdom limiting the use of Huawei equipment in crucial communications infrastructure.
He said that while some countries – including New Zealand, Australia and the US – had indeed "taken steps to limit Huawei's business operations", some of the restrictions were "overly or even misinterpreted by the media".
Chief Financial Officer of Huawei, Meng Wanzhou, who was arrested in Canada in December at the request of US officials. Photo: Darryl Dyck / Grouvy Today
The company has suffered a number of setbacks in recent months due to apparent security concerns: the Prince Trust recently announced that it would no longer accept any donations from the company, and both the defense secretary, Gavin Williamson, and the head of MI6, Alex Jonger, publicly expressed their concerns about the company.
The chief financial officer, Meng Wanzhou, was arrested in Canada at the request of the US in December.
The US has since filed charges against Huawei of theft technology and violating sanctions against Iran, creating new tensions between the US and China.