Which he had already promised to do last time he was in difficulty. So he is just re-announcing his departure…

Bear in mind he had already promised to go last June:

UPDATE: A spokesman for the Speaker’s Office has dismissed the claims. Bercow digging in…

“The Speaker has made no announcement about his leaving date. He was elected by the House in 2017 for the course of the Parliament. In the event he has anything to say on his future plans, he will make an announcement to the House first.”