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A drab office block sandwiched between a pub and a branch of Starbucks was a secret base of spy agency GCHQ, it has been confirmed.
The anonymous building opposite St James's Park Tube station in central London was used by British spooks for 66 years.
Despite the covert goings-on within, neighbours said the address's purpose was an open secret among locals.
GCHQ acknowledged the location after moving out of its home.
The Chinese company Huawei has been strongly criticised in a report by the body overseeing the security of its products in UK telecoms.
The report, issued by the National Cyber Security Centre, which is part of GCHQ, says it can provide "only limited assurance that the long-term security risks can be managed in the Huawei equipment currently deployed in the UK".
The report reflects what are said to be deep frustrations at the failure of the company to address previously identified problems.
Huawei supplies telecoms for telecoms companies operating in the UK and this report comes ahead of a decision by the UK over whether to allow the company to build next generation 5G networks.