At least two of which had major inquests afterwards.
With Gibraltar the SAS unit thought they had positioned the bomb car and were moments from blowing it up, it was infact a blocking car. Afterwards there was an inquest.
The Loughgall ambush occurred when the IRA blew up a bomb and started shooting up a police station. Not sure why that one was any different to police taking out someone shooting up a school (as an example). It doesn't appear to be that relevant to this situation, unless they were launching an ICBM?!
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Either way there was no inquiry but:
This backs up the argument of people asking for an investigation.
As I've said multiple times I don't think the British government have broken the law, they wouldn't be that stupid. However I think there is a legitimate issue to be discussed regarding the legitimacy of this and where the line can be drawn with the British government extra judicially killing British citizens in a country where there they have no mandate to fight in.
Could they use this legal basis to gun down British citizens in Paris, because they may commit a terrorist act in a few weeks/months for example?