I'm going to retweet the crucial evidential pictures of the #Salisbury suspects in the correct chronological order, with some maps. It shows how quickly the suspects struck and left the city. Here's the thread:
1) Arrival in Salisbury. "Petrov" and "Boshirov" take a train to Salisbury on Sunday 4 March - after carrying out recon the day before. Here they are at Salisbury station at 11.48am. They are about a mile or so from Mr Skripal's home: 
2) Ten minutes later, they're filmed on a petrol station CCTV on Wilton Road. Police say this was on the way to the attack. This makes sense if you consider the direction they are walking and their proximity to Mr Skripal's home:
3) We know the Novichok was applied to Mr Skripal's front door handle. Police have today released this image of the counterfeit perfume bottle that contained the nerve agent:
4) Petrov and Boshirov leave the scene. Where they go next isn't clear - various route options- but the bottle was found in a charity bin in the city. The Russians are seen on CCTV on Fisherton Street at 1.05pm and 1.08pm respectively, possibly on their way to the train station:
5) At 1.50pm, another CCTV camera at Salisbury station captures the men at the train station as they begin their return to London:
6) And hours later, they're at Heathrow and leaving the country:
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