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It is clear that Sergei Skripal's house was not regarded as crucial to the investigation, or a potential health risk, until several days after the incident.
A number of locations were said to have been cordoned off.
As part of our attempts to check what we had been told we went to Mr Skripal's publicly listed address, arriving around 24 hours after the incident at the Maltings Shopping Centre - the area where the pair had collapsed.
There was a police car on the drive, an officer sitting inside, but there was no cordon. We were able to walk within a few metres of the door, but we didn't knock.
We were aware there might be a health risk, and one of our team had received past training in chemical and biological threats.
There is no suggestion the police had not assessed the risk at the house.
But the response was markedly different there compared to the measures in place at Salisbury District Hospital, and the Maltings, where a team in full protective gear had already carried out some decontamination.
Members of the emergency services in biohazard suits afix a tent over the bench where Sergei and Yulia Skripal were found
At 18:00 GMT that day, the BBC broke the news that Mr Skripal was at the centre of the incident.
Meanwhile police were reviewing CCTV images and realised the pair had visited the Zizzi restaurant and a nearby pub. These sites were sealed off that evening, after closing time.
http://www.bbc.com/news/uk-43586715