It all comes down to Boris. On the face of it, he is master of the political battlefield. A weak opposition, his own party more or less united, or at least quiescent: a huge lead in the opinion polls and an apparently endless supply of good luck: with all those assets, what could possibly go wrong? Yet that is not enough. There is a more basic question. What will go right? The PM has the power. How does he propose to use it?