What next for Starmer after Rayner exit?

As Sir Keir Starmer delivers a sweeping cabinet reshuffle at the end of perhaps the most bruising week of his premiership so far, we ask his authorised biographer whether he can still turn it around.
Also:
The Reform UK leader, Nigel Farage, has told his party's conference to be ready for a general election in 2027.
And the Duchess of Kent, the oldest member of the royal family, has died at 92.