I had in fact decided that their story was highly improbable, until I started seeing the storm of twitter posting, much of it from mainstream media journalists, which stated that individual things were impossible which were, in fact, not impossible at all.
The first and most obvious regards the weather on 3 and 4 March. It is in fact absolutely true that, if the two had gone down to Salisbury on 3 March with the intention of going to Stonehenge, they would have been unable to get there because of the snow. It is therefore perfectly possible that they went back the next day to try again; and public transport out of Salisbury was still severely disrupted, and many roads closed, on 4 March. Proof of this is not at all difficult to find.
Read more: https://www.craigmurray.org.uk/archives/2018/09/the-strange-russian-alibi/