Former spy Sergei Skripal and his daughter Yulia remain in a very serious condition but the police officer is getting better.
A vehicle recovery centre is being searched as part of the latest investigation into the nerve agent attack on a former Russian spy.
It is believed the building was searched overnight as Sergei Skripal’s maroon-coloured BMW is inside.
Former double agent Mr Skripal, 66, and his daughter Yulia, 33, remain in “a very serious condition” in hospital after they were found slumped on a park bench in Salisbury on Sunday evening.
DS Bailey is believed to have been the first person at the scene, although there are now suggestions he may have become ill after retracing Mr Skripal’s steps from his home in Salisbury.