The post you are reporting:
Really, there's so much wrong with that Guardian piece, not least the utter toothlessness of the modern incarnation of what used to be a half-decent newspaper. So I'll pick a couple of things from Mr Sedwill's letter (which, contrary to the Guardian's claim, contains no evidence at all, but simply a summary of 'evidence').
I note that the mysterious DS Bailey (or 'Police Sergeant' in the letter) has been relocated to the park bench (as a 'first responder') from which he had been summarily removed to Mr Skripal's house when people first began to smell a rat. Presumably this relocation is supposed to explain away the DS's relatively quick exit from hospital, since he wasn't after all anywhere near that nasty doorknob where the 'highest concentrations' were. A 'matter of fact' indeed.
How do you 'stockpile' 'small quantities' of anything? It's a contradiction in terms.
How would British intelligence know the GRU was hacking Ms Skripal's email accounts unless it had been monitoring those accounts itself? And if they were aware of 'Russian intelligence service interest' in the Skripals then is it just sheer incompetence that allowed Russia to get to them?
There are so many 'highly likelys', 'likelys', 'unlikelys' and 'highly unlikelys' in the letter that you could quite easily miss the wood for the trees, which is probably the intent. But here the Guardian's man tries to come to the rescue with a bit of insider knowledge that's worth quoting at length: 'the term 'highly likely' is one commonly used by the intelligence agencies when they believe something is 100% certain - since they are unwilling to express that opinion without a caveat in case of error'. Ah, that clinches it then. Except, since when did you need 'a caveat in case if error' when you are '100% certain' of something?
And still no explanation of how a couple of people can go on a 3 or 4 hour jaunt around Salisbury, taking in a drink at a pub and a meal at a pizza restaurant, after being exposed to a 'military-grade nerve agent' of 'high purity'.
Laughable.