The murderer's plan near the end of Luther: The Fallen Sun was supposed to culminate in him debuting a website where would-be murderers could vicariously participate in his killing of random people from his Estonian bunker, a la Red Rose.
However, by all appearances, the livestream was public, since the police were able to access it, and from the glimpses that we see, Robey's real face and voice were apparently visible. Further, Robey had revealed his face while holding a knife to a bystander in the middle of a crowded London square with innumerable bystanders and cameras. Finally, whatever he had intended to do with respect to DCI Raine, it would presumably have ended with him having little leverage over the case: either because she had her daughter back, or because her daughter was dead, or because both were dead and the case was handed over to someone else. In short, Robey seemingly would have had little possibility of either concealing his identity or controlling the course of the investigation, and presumably knew this at that point.
As such, what were Robey's plans for after he revealed his "Red Bunker" stream? Did he have a plan to try to avoid capture? Did he simply not care what happened next, thinking that it was enough to achieve his life's work?