Keir Starmer was facing fresh questions about his judgment last night after removing a third senior aide in a bid to turn round Labour's dire poll ratings.
Downing Street sources confirmed that the Prime Minister's principal private secretary Nin Pandit is leaving the role just 10 months after being appointed by Sir Keir as his gatekeeper.
Her departure follows the sacking of former chief of staff Sue Gray last October and the departure of former No 10 communications chief Matthew Doyle in March.
Whitehall sources said she is set to be replaced by the senior Treasury official Dan York-Smith in a bid to ensure No 10 has greater oversight of the Budget.
One insider said the move was designed to prevent the PM being 'blindsided' by the Treasury again, following complaints that there was too little consideration of controversial moves by Rachel Reeves, such as scrapping the winter fuel allowance and slashing disability benefits, both of which had to be dropped.
