Let's accept for a moment that there was a threat, for the sake of this discussion let's take it on faith that there was.
At what point, in your mind, is the British government allowed to protect its citizens from being murdered? Genuine question and would be interested in your answer.
I can guess that Amps viewpoint is one of concern over the manner in which this strike has been carried out. It was done in secret, in what may seem a dirty underhand way and perhaps he is worried about the precedence it sets? However, my response to that is so what of the alternatives?
Boots on the ground. Much more loss of life. Or maybe even send in a team to go after him, which is incredibly difficult and highly unlikely to result in a positive outcome where he doesn't just evade and disappear forever after.
Mind you, given the amount of money spent on doing these strikes I said you could give me £1m and I'd happily walk down his Street and shoot him for old DC myself
Spot on.
For starters I'd argue there should be some kind of judicial oversight in it before the killing. Perhaps a judge looking at the evidence and agreeing, or even a trial by jury (with the accused not in court). This may have happened, it may not- it could have just been the Home Secretary authorising based on being asked by "xyz". Obviously it would depend on the immediacy of the threat (which we don't know) and what the threat actually was (were they coming to the UK to bomb somewhere or was it outside the UK for example)? Perhaps they could have arrested him when they had the possibility (travelling through a more stable country getting to the target), although they run the risk of losing them.
Personally I think we should go into Syria hard and clear it out, let's force ISIS back into Iraq where it came from. I understand though that t would be political suicide both because it would be another war and because we would have to work with Assad to do it successfully (and perhaps have to organise an alternative to execution for Assad and his head honchos, so they could be persuaded to leave power - perhaps exile in Russia?)
Obviously it's not my area of expertise, it may have been the best option, there may have been other alternatives, I was just bringing up the question as it's an interesting debating point. It's also clear that there may actually be some president for an inquiry/investigation into the killings.