However bad Keir Starmer is as PM (and he really is bad at it), there's a strong national security argument to keep him in place until June 2. That's the date industry now expects the government to publish its much-delayed Defence Investment Plan. Once a leadership contest is underway, the civil service will insist on suspending any decisions on it for the new PM - so the crucial job of re-building the UK's hollowed out defences will get pushed back yet again, to at least the Autumn and perhaps 2027. That piles more risk on already significant risk. As any serving senior officer will tell you, we are not safe. We'll be even less safe by then.