Does this mean the attack was made with a UK poison?
IIRC, the attack occurred not far from Porton Down-It is home to two British government facilities: a site of the Ministry of Defence’s Defence Science and Technology Laboratory (Dstl) - known for over 100 years as one of the UK’s most secretive and controversial military research facilities.
Widely discussed as a False Flag blaming Russia for something it did not do. Russia had big objections, because the internationally agreed investigative agency for such things had not even investigated and yet all these sanctions against Russia were being insisted on.
Probably.