The pair were found collapsed on a bench in Salisbury on 4 March.
They remain in a critical condition.
Traces of Novichuk had been found at other sites in the city, but they were at lower concentrations.
About 250 counter terrorism officers continue to work on the case
5,000 hours of CCTV footage and 1,350 items have been seized and examined.
Timeline of events
3 March: Yulia Skripal flew into London’s Heathrow Airport on a flight from Russia at about 14:40 GMT
4 March, 09:15 GMT: Mr Skripal’s car was seen in Salisbury in the area of London Road, Churchill Way North and Wilton Road
4 March, 13:30 GMT: His car was seen driving down Devizes Road, towards the town centre
4 March, 13:40 GMT: Mr Skripal and his daughter arrived at the Sainsbury’s upper level car park at the Maltings shopping precinct.
4 March, between 41:20 GMT and 15:35 GMT: Police said the pair went to The Mill pub before going to Zizzi restaurant
4 March, 16:15 GMT: Emergency services received the first report of an incident
4 March: Police found the pair on a bench outside Zizzi in an “extremely serious condition”
4 March: Det Sgt Nick Bailey fell ill after attending the incident – – was treated in hospital but discharged on 22 March
48 people were assessed in hospital in relation to the incident
Only Mr Skripal and his daughter Yulia remain in hospital
Investigators have identified 131 people who have potentially been in contact with the nerve agent.
None has shown symptoms
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