From what I've seen, it simply doesn't work. But that's irrelevent—a key point is, IMHO, Boris wasn't expecting or even hoping to win, and while Cameron is obviously pleased with the result, I suspect he's now shitting himself that Boris will mess up somewhere.

Hence the bendy bus/routemaster thing—a headline grabbing populist policy that didn't need any grounding in reality as it was only there to get attention. Ah well.