"no clear conclusive proof that shot the killed WPC Yvonne Fletcher was fired from Consulate."
BS of the highest order.
The Libyans were lucky to get out. A pity the SAS were not sent in to
"do the job" that should have been done juts like the Iranian embassy.
You never know, one day we might just get to the bottom of it.
"However if they fire without being fired upon then they pretty much lose diplomatic protection and any actions of host Govt in response could be classified as acceptable."
Of course, but that is why you have very clear ROE's and
you don't station hot headed dick heads in those roles.
Pretty much nobody can say with enough evidence that will stand up in a court of law, even ballistic experts are unclear.
As for attacking the building.............you can't because like the oft claims of just go into Ecuador building and take Julian Assange. SAS go in and shoot lots of people then you allow ANY Govt to do exactly what occurred in Benghazi and in diplomacy then use precedence all the time.
Oonce you do it then Uk diplomatic missions overseas are fair game for any country and you have no fallback................would you really wish FSB to walk into Embassy in Moscow ?