Calling Murray a "nutjob" is not conducive to a well-informed discussion about touchy subjects. His last summary of the Skripal case is [1], and while certainly controversial, hardly a "nutjob".

He was removed from his ambassadorship to Uzbekistan because he protested against human rights violations in Uzbekistan. This may not be what an ambassador should do, but displays integrity.

[1] https://www.craigmurray.org.uk/archives/2019/03/pure-ten-poi...