"Senior sources have told the Telegraph they are convinced"

Well I am not!
I do not believe in father christmas, or the tooth fairy either.

"Senior sources" = A feeble attempt to convince the masses that the source has credibility. Of such devices is made the onward march of propaganda.
We are now importing foreign experts to confirm the source of the poison-no doubt it comes in a sack with a visiting card enclosed.
Another pathetic attempt, publicised in the daily wail, to add momentum to the current fairy tale.
Meanwhile Vlad the lad is re-elected with a huge majority, naval forces gather in the Med, and brexit draws ever nearer.

Is real news being buried by this poisoning distraction?