Yulia arrived at Heathrow Airport on a flight from Russia at approximately 14:40hrs on Saturday, 3 March.
At approximately 13:40hrs on Sunday, 4 March, Sergei and Yulia arrived in Sainsbury’s upper level car park in the Maltings.
At some time after this, they went to the Bishops Mill Pub before going to Zizzi Restaurant at approximately 14.20hrs, where they stayed until around 15:35hrs.
Emergency services received a report from a member of the public at 16:15hrs and police officers arrived within minutes at the scene to find Sergei and Yulia extremely ill on a park bench near the restaurant. Subsequently, scientists have determined this to be the result of an identified military grade nerve agent.
14.40hrs on Saturday 3 March: Yulia arrives at Heathrow Airport on a flight from Russia.
09.15hrs on Sunday, 4 March: Sergei's car is seen in the area of London Road, Churchill Way North and Wilton Road.
13.30hrs: Sergei's car is seen being driven down Devizes Road, towards the town centre.
13:40hrs: Sergei and Yulia arrive in Sainsbury's upper level car park at the Maltings. At some time after this, they go to the Bishops Mill Pub in the town centre.
14.20hrs: They dine at Zizzi Restaurant.
15:35hrs: They leave Zizzi Restaurant.
16.15hrs: Emergency services receive a report from a member of the public and police arrive at the scene within minutes, where they find Sergei and Yulia extremely ill on a park bench near the restaurant.