'Novichok is reported to be 5–8 times more lethal than VX nerve agent and effects are rapid, usually within 30 seconds to 2 minutes.' - Ian Greaves FRCP, FCEM, FIMC, RCS(Ed), DTM&H, DMCC, DipMedEd, RAMC, Paul Hunt MBBS, DipIMC(RCSEd), MCEM, MRCSEd, DMCC, RAMC, in Responding to Terrorism, 2010.
Skripal crime scene, early evening of 4 March 2018.
Two people encircled in previous image. Image crop by @JohnDelacour
With thanks to @JohnDelacour for technical assistance.
'Two women have been taken in an ambulance from Sarum House which is a building in between Zizzi and Tesco.' - Spire FM, Incident in Salisbury city centre by Zizzi, 7 March 2018.
One of the women appeared to have a ring on her left hand. The other woman appeared to lighter and wavier hair, with apparently no ring on her left hand:
The two women appeared in a spliced youtube video: https://www.youtube.com/watch?v=qowRoxI0fS0