Obviously I am right. I am always correct, murderer anonymous. Although I do prefer murderous anonymous, has a nicer sound to it. Would be a fine name for a serial killer, maybe I will take that name if I should ever deviate from my current profession. I could make a fantastic job as a serial killer. They would never find me, being the idiots they are.
@di-greglestrade another clue for you. Check the flights, trains, busses, basically anything and border controls of everyone coming from spain to the UK during the last weeks, although it's most likely that our murderous anonymous arrived this or last week, due to the sudden onset of killings. Now compare those lists with suspect profiles, the found DNA, reason for the travel, et cetera. And there, got your anonymous killer. I can't do your whole job for you, also do something on your own Graham.
You really owe me one now, Lestrade.