Photo by James Manning/ PA via Alamy

Keir Starmer will try to save his political career this morning by giving a speech in which he will admit mistakes and say “incremental change won’t cut it”. The most immediate consequence of the speech will be whether it makes Catherine West – the backbencher threatening to launch a leadership challenge this morning – think twice.

West has said she might step down her plot if Starmer shows sufficient rhetorical fire in his belly. But that will be quite a difficult metric for outside observers to judge – and so we will have to wait and see how West responds to the speech.…