What ISIS did was abominable, and may yet serve to unite the world against them. Then again, if having the wife of a government official kidnapped wasn't enough to get other nations to strike down Boko Haram, then I'm not sure what effect this will have. That said, nothing would please me more than seeing both of those slaving bastards getting their asses kicked (ISIS and Boko Haram).
As for Scotland Yard, well..the people downloading it would be idiots, but then, Scotland Yard should be careful not to overreact on this as well.