https://www.theguardian.com/technology/2020/jul/05/boris-johnson-now-has-sound-reasons-to-keep-huawei-out-of-uk-5g > Former MI6 chief said US sanctions on Huawei meant Chinese telecoms firm now posed security risks to UK > Boris Johnson now has “sound technical reasons” to reverse his decision to allow the Chinese firm Huawei to play a role in building the UK’s 5G infrastructure, a former head of MI6 said on Sunday.