The British government case that Russia was responsible for the poisoning by “Novichok” of ex Russian spy Sergey Skripal and his daughter initially relied on the argument that Russia had the “means, the intent and the motive” to do it and thus must have done it. The public was also told that the substance had been identified as coming from Russia – something which they subsequently had to retract. Subsequently it emerged that Porton Down had not in fact identified the sample they had as coming from Russia.
The government case fell apart. Also – most people can see through the argument that Russia had the means and motive. Yes; they have the means and one can ascribe a motive to them. But many others might have a motive as well. Not everyone who has a means and a possible motive to commit a crime is guilty of that crime. A simple piece of “fake logic”. Following the collapse of their case the government tried to shore it up with a series of placed stories in the press. One of these is that Julia Skripal (Sergey Skripal’s daughter) was under surveillance by Russian intelligence. Of course she was! She is the daughter of one of their major traitors of recent times – and was in touch with her father. Julia Skripal was no doubt being monitored by the British as well. Maybe there was even a hand-over when she arrived on a plane from Moscow? At any event that she was under surveillance by Moscow means zero as to whether or not Russia had a hand in the poisoning (by BZ and/or a nerve agent) in Salisbury of her and her father. Another attempt to fabricate a story out of thin air. 
(The fact that the British government is producing all these pieces of ‘evidence’ which any rational analysis can see do not support the claims being made on the basis of them itself shows that something very odd is going on).
The only piece of ‘evidence’ left is the claim that British intelligence has in their possession a training manual from Russia – dated to Russia not the USSR – which specifically discusses carrying out assassinations by smearing a nerve agent of the “Novichok” type on a door-handle – where the nerve agent was allegedly found in Salisbury. It is likely that British intelligence do indeed have some kind of a document which somehow can be construed as a “training manual” and which can somehow be said to be dated from post 1991. It could be anything e.g. a discussion paper of some kind. British intelligence won’t be too scrupulous about the truth.
At any event the question at the heart of this matter is – which came first; the “training manual” or the ‘Novichok’ on the door handle? To spell it out: if you wanted to commit a crime and frame Russia and if you had inside knowledge about this “training manual” and that it mentioned door-knobs – where would you put your (very pure) sample of ‘Novichok’?