Re: It's simple
"Which, obviously, they will never ever do, because that would be impossible as well as utterly insane. How do you propose they'd order the OpenVPN or OpenSSL or OpenSSH developers to add backdoors for the UK government?"
Sure. For now. Of course, if you are using such services, and the snoopers want to know what you are up to, they will now have every justification in invading your machine getting to the plaintext data. I expect this will happen routinely from now on. Perhaps the OS vendors will only be too happy to oblige, making it easy, seamless and invisible.
Biting the hand that feeds IT
