Demolition starts at the flat where Dawn Sturgess was fatally exposed to the nerve agent.
Read moreAmesbury Novichok poisoning
What is Novichok?
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Video caption: Germany says there's 'unequivocal proof' that it was used to poison Alexei Navalny Germany says there is 'unequivocal proof' that Russian opposition politician Alexei Navalny was poisoned with the nerve agent
By Steven McIntosh
Entertainment reporter
By Gordon Corera
Security correspondent
By Jordan Davies
BBC News
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Video caption: Salisbury Novichok: 'We knew how dangerous and deadly it was' Former Russian spy Sergei Skripal and his daughter Yulia were targeted with the nerve agent.
By Olga Ivshina
BBC Russian Service
By Mark Urban
Diplomatic and defence editor, Newsnight
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Video caption: May: Russia must stop 'destabilising' activities Ahead of one-one-one talks with Vladimir Putin, Mrs May speaks about the Novichok poisoning.
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Video caption: Inside Britain’s top secret research laboratory The BBC was given access inside Porton Down, where some of the world's deadliest viruses are researched.