Mycroft's ruse
Question: Mycroft was working with British Intelligence when he lied and told Sherlock that his father wanted him to return to London, then called what I assume was his handler to say that his ruse didn't work and that they would have to come at the problem some other way.
Why did he need to get rid of Sherlock? It turned out that Le Milieux kidnapped Joan and Mycroft said that he could get the 'list' for them in exchange for Joan, but what was the scheme before Joan got herself kidnapped?