I certainly cannot speak for my British "cousins", but as a friend and one who shares the grief and outrage of this dastardly and deliberate attack on unarmed, defenseless civilians. I don't believe for a second that it was a "military action" by a "soldier of the faith." This was a criminal act, with no righteous justification.
That the British government would render "military honors" to these victims is a reasonable question. However, Britain has signalled to their families and also to the world that life is precious, that this loss cuts deep into the soul of the nation, and especially that It will not be forgotten. We see too many horrors in the news every day that tend to create emotional callouses, we get so accustomed to them.
I hope that Britain and their friends will be courageous and never forget what happened and never let these evil men and those who planned these acts get away with murder. Hunt them down, never let them rest, and seek justice, not revenge.