Oh look. David Miliband is back, making another pop-up appearance in British politics. This time he wants us to know that he thinks Jeremy Corbyn has made Labour unelectable.

The most remarkable thing about this stunningly banal observation is that some people seem to think its author is still worth listening to. The Corbynites are often, rightly, described as cultists, but the other side of the Labour divide has its superstitious and irrational beliefs too. The curious reality-defying cult of David Miliband is a case in point.

The fact that some in Labour still listen to Mr Miliband says a great deal about the party and its optimistic, even naive side: many Labour people dream of a king over the water, the return of a lost leader who can restore order to the kingdom. A second coming.

And there's nothing wrong with those dreams, but Mr Miliband is not a worthy vessel for them. He's not Bonny Prince Charlie and he's not the messiah. He's a failure.