PFR,
the highly dubious Boris/May account of what happened in Salisbury....

Boris/May account, informed by the police, security services and OPCW.
You choose to believe enemies of the West over them for political reasons.

The Russian government has rigid control of what all its police and security services say and do, it is not anwerable to a free opposition or a free media, and has been exposed as liars over and over again.

That is not true of UK or Western governments. You are just an anti-West extremist.