Johnson has sunk to a new low - and Rees-Mogg joins him in the sewer

 She stood by his side and advised him at County Hall when he blew council-taxpayers' money on useless water cannon and the aborted "garden bridge". She followed him into government and remained loyal when he committed gaffes as foreign secretary and fouled up Brexit as prime minister. But even for Munira Mirza, Boris Johnson's despicable personal attack on Sir Keir Starmer went too far, and she has resigned along with three other Downing Street staffers.

Congratulations to Rishi Sunak for dissociating himself from the Savile slur. One wishes that Jacob Rees-Mogg had demonstrated similar integrity as Leader of the House yesterday. Instead, at Business Questions yesterday, he sought to use the Crichel Down affair, in which a Conservative minister took responsibility for malfeasance by officials in his Department and resigned, as justification for the attack on Sir Keir as DPP. Perhaps he should have followed his own logic. Sue Gray's official report on "partygate" highlighted breaches of procedure by staff. On that basis, the prime minister as their ultimate boss should have resigned.