In response to a claim that a chemical factory capable of producing novichok would "have to be" one funded by a government, I simply said WE had such a factory. I said nothing whatsoever about Porton Down actually doing any such thing.
There is endless evidence, Peter Pedant, of the Queen's accession and of Germany and America's wartime bombings. We don't need a court case to prove any of these. I can actually vouch for one of these personally, given that such a bomb landed less than 100 yards from where my baby head lay sleeping. I woke up eventually; others nearby never woke up again!
Given the indisputable fact that the method of producing novichok is in the public domain, on what grounds do you imagine only one organisation could have made the batch responsible for Wiltshire's woes?
I believe Russia is vastly more likely to be the culprit than anyone else, but I have already explained what I think of the "Likelihood Theory" of guilt. It's just not enough, mate! (I'll leave it there.)