The Conservatives need to prepare for life after Mr Cameron. He is not going anywhere in a hurry. But he is now easily at least half‑way through his time as Tory leader. By this autumn he will have been in the post seven years, and once he has fought the next election he has no desire to go on and on, believing that staying too long in office did the reputation of his predecessors considerable harm. He will not seek a Blair-style peripatetic existence in retirement – in five years or so, he will probably want to retreat into rural England to enjoy seeing his children grow up.