Both Mr Skripal and his daughter were critically ill after the alleged assassination attempt in which the nerve agent had been sprayed on a door handle at their home.
Detective Sergeant Nick Bailey, who attended the scene, also needed hospital treatment and previously said he was “petrified” by the experience.
He told Panorama last November: “I didn’t understand how it had happened, scared because it’s the fear of the unknown because it’s such a dangerous thing to have in your system. Knowing how the other two (the Skripals) were or how badly they’d been affected by it, I was petrified.”
Last September, Scotland Yard and the Crown Prosecution Service said there was sufficient evidence to charge two Russian nationals named as Alexander Petrov and Ruslan Boshirov with offences including conspiracy to murder over the Salisbury nerve agent attack.
It was subsequently reported by Bellingcat that Mr Boshirov was actually highly-decorated Colonel Anatoliy Chepiga, and Mr Petrov was a military doctor called Alexander Yevgenyevich Mishkin.
Both men told Russian state-funded news channel RT they travelled to the “wonderful” city in Wiltshire to see Stonehenge and Old Sarum after recommendations from friends.
Russian president Vladimir Putin has previously denied the men identified by the UK were responsible for the attack.