Latest: Russian ambassador accuses UK of destroying evidence in Skripal poisoning case

Latest: Russia's ambassador has accused the British authorities of destroying evidence in the Salisbury nerve agent attack.

Update - 1.45pm: Russia's ambassador has accused the British authorities of destroying evidence in the Salisbury nerve agent attack.

Alexander Yakovenko said the UK had yet to produce the evidence to back its claims that Russia was responsible for the poisoning of former spy Sergei Skripal and his daughter, Yulia.