That it coincidentally happens during a coordinated anti-Russian media onslaught should be taken into consideration. The US/UK are not above fabricating evidence when it suits them, as their post-9/11 tactics have made clear.
If you genuinely think the UK needed a couple more dead Russian dissidents (and pretty unsympathetic ones at that) to justify stricter sanctions on Russia, you really, really don't understand the relevant politics.
It reminds me how some religious communities go after the people who don't follow their rules even after they flee to other country [2].
[1] https://en.wikipedia.org/wiki/Leon_Trotsky#Assassination
[2] https://meduza.io/en/feature/2017/05/25/we-will-set-them-str...
https://cs9.pikabu.ru/post_img/2018/03/13/8/1520947357114473...
And
http://i12.pixs.ru/storage/2/3/6/Bezimyanni_3398267_29746236...
Nobody is stupid enough to honestly believe that. Nobody. Jog on troll.