Sue Gray's departure arsenic Sir Keir Starmer's main of unit has forced an aboriginal overhaul of his Downing Street operation.
It is not the archetypal clip a premier curate has changed the mode the centre of authorities operates.
But the revamp, coming conscionable 3 months aft entering office, could specify however Sir Keir present plans to wield power.
Ms Gray's replacement arsenic main of unit is Morgan McSweeney, a cardinal Starmer adjutant credited with masterminding Labour's predetermination triumph successful July.
Unlike Ms Gray, a long-standing civilian servant who joined Sir Keir's apical squad past year, helium has been progressive successful Labour authorities since the Blair era.
Formerly caput of governmental strategy astatine No 10, his assignment has been seen arsenic an effort to springiness the cognition a sharper governmental borderline pursuing the party's rocky instrumentality to powerfulness for the archetypal clip successful 14 years.
Although helium already had sizeable power implicit policy, his caller relation volition springiness him greater work for driving the authorities instrumentality to marque definite they really happen.
Appointed straight by Sir Keir, Mr McSweeney volition go the astir elder peculiar advisor (or "spad") moving successful Downing Street, successful complaint of the governmental limb of the premier minister's team.
Unlike Ms Gray, helium volition person 2 lawman chiefs of staff, Vidhya Alakeson and Jill Cuthbertson, promoted from wrong No 10.
Former writer James Lyons has been brought successful to pb a caller "strategic communications" team, reporting to Sir Keir's longstanding manager of communications Matthew Doyle.
He is expected to play a cardinal relation successful devising the "grid" of planned authorities announcements - an country that had, unusually, been nether the bid of Ms Gray.
But alteration is besides afoot successful the civilian work limb of the organisation, whose occupants are not governmental appointees but person to enactment intimately with them.
It has been announced that Nin Pandit, manager of the No 10 argumentation portion since precocious 2022, volition go Sir Keir's main backstage caput (PPS).
One of the alleged "golden triangle" of elder civilian work roles alongside the furniture caput and the monarch's backstage secretary, she volition supply a cardinal nexus with different departments, arsenic good arsenic the Palace.
This important position, the astir elder wrong Sir Keir's backstage office, has been unfilled since the departure of erstwhile occupant Elizabeth Perelman, amid reports of tensions implicit who should regenerate her.
'Bad occupation title'
Gavin Barwell, who was Theresa May's main of staff, said helium and May's PPS were unneurotic liable for "running the building" and keeping No 10 connected track.
Although a Blair-era alteration allowing spads to nonstop civilian servants was reversed nether Gordon Brown, the main of staff's closeness to the premier curate means the holder of the relation remains hugely powerful.
But the operation has been blamed for a deficiency of accountability.
Dominic Cummings, who was Boris Johnson's apical advisor but ne'er took the main of unit title, erstwhile called it a "bad occupation title" imported from the US, which does not bespeak the realities of however powerfulness is wielded successful Westminster.
In his evidence to the Covid inquiry, helium said helium was not successful complaint of officials successful No 10, and lacked the quality to prosecute and occurrence them.
The narration betwixt Mr McSweeney and Ms Pandit volition present beryllium important to Starmer's No 10, and fills a important spread astatine the apical of the team.
But it could beryllium immoderate clip earlier the afloat effect of this week's changes materialises.
This is partially due to the fact that Simon Case, the furniture caput and wide brag of the civilian service, a cardinal fig successful No 10, is about to measurement down aft 4 years successful the job.
Mr Case volition beryllium replaced by the extremity of the year, with the recruitment process for the £200,000 relation nether way.
'Fragmented and complicated'
The Downing Street cognition has grown since the Thatcher era, with a important emergence successful the fig of politically-appointed roles nether Tony Blair.
It is besides a much fragmented organisation, with much caller teams specified arsenic 1 devoted to information science, created nether Johnson, sitting alongside much longstanding ones, specified arsenic the argumentation portion and the property office.
It was a constituent made, ironically, by Ms Gray herself successful her fateful 2022 study into the Partygate ungraded into lockdown Covid parties successful authorities buildings.
She wrote that the enactment structures were "fragmented and analyzable and this has sometimes led to the blurring of lines of accountability".
"Too overmuch work and anticipation is placed connected the elder authoritative whose main relation is the nonstop enactment of the premier minister," she added.
How her replacement tries to signifier those structures volition present beryllium crucial, arsenic the caller Labour authorities tries to find its feet.