I still maintain you are speculating and cannot conclude with any authority, the full extent of the knowledge the Govt. have. At some stage that might become clear and you could well be proved right.
Everybody who has an opinion, including you, I and the British government, is using the information they have to form their opinions or conclusions. As far as we know at this point, the British government cannot conclude with any authority who was
really responsible. They have not stated that they
really know who did it but they have used what they know, added that to what they believe and have then come to a conclusion.
I'm interested that now both victims appear to be making good recoveries, little mention has been made of previous claims that there was no known vaccine / cure / treatment for this poison. Even the guy who worked on it claimed there was no cure and that they will both die.
Yes, no known vaccines, sure to die, lethal "military grade" nerve agent, but vitimes now recovering. The narrative seems to be unravelling. Perhaps we will soon be informed of a new vaccine created in the UK in the last few weeks by British scientists. Watch this space.