Re: Who operates Huawei kit ?
It is possible to turn off the Huawei kit's connection back home to Mummy and to support it yourself. Even with a nice, cheap routine support contract out to said Mummy, you only need the key to the server room to terminate the contract with extreme prejudice. A little wiresharking or similar will soon tell you if there is a secret backdoor you hadn't found, and a firewall will soon fix that.
One can only speculate whether the cyberspooks read the user instructions carefully enough to spot this, or whether they actually practise the lockdown techniques they are so fond of preaching on their publicly-available (but expensive) NCSC (formerly CESG) courses.
Certainly, Trump and some 38 of our Tory MPs (who were among those trying to vote Boris's limited rollout down) have no idea of such niceties - and no wish to be aware of them.