Speaking at the Dawn Sturgess Inquiry in London ... became contaminated via a discarded perfume bottle in nearby Amesbury.

The witness told the inquiry that a sample of the nerve agent the size of ‘a third to a sixth of a grain of salt’ could be fatal to a human.

ITV News' Chloe Keedy reports from the Novichok inquiry, where a senior Met Police officer spoke of the search for where ...