Just why Sir Paul would axe such an ally some believe speaks volumes about the way his life has changed since marrying Heather in 2002.
THEY have abandoned the Peasmarsh home, where he and Linda raised their children, and based themselves at a house in Hove with their daughter Beatrice.
While Sir Paul and Linda once prided themselves on their unpretentious lifestyle, under Heather's influence, the McCartneys are reinventing themselves.
Although Sir Paul continues to deny them, rumours that Heather is keen for them to move to LA so that she can pursue her ambition to become a TV star refuse to go away.
Heather is said to harbour dreams of hosting her own chat-show, despite her woeful interview with Paul Newman while standing in for US host Larry King last year.
If Sir Paul does quit Britain for the anonymous glitz of LA, his old life will have vanished for ever.
There was a poignant moment during the star's recent appearance at the Glastonbury festival when as he played Wings songs, fans chanted Linda's name - and Heather stood watching from the side of the stage.
In this new, rather more showbizzy world that Sir Paul has embraced, rough-and-ready Geoff, with his mop of black-grey hair, scuffed leather jackets and jeans, seems somewhat out of place. Baker himself doesn't appear surprised by his dismissal.
This seemingly final split comes nearly a year after Sir Paul fired him temporarily, over a incident with a photographer who snapped the ex-Beatle as he visited magician David Blaine during his glass box stunt in London.
A scuffle broke out and Baker, who had just dined with the star in a Soho restaurant, later admitted tipping off the snapper. He was sacked and then reinstated.
He later claimed: "For some reason - probably only known to my mental hospital - I decided to tell a photographer to come over. Paul was incandescent."
One associate confirms: "That was always the way Geoff operated. Before, Paul was usually amused by the way Geoff did things.
"But his fury over the Blaine incident was a clear indication that things in the McCartney world were changing."
HE had screamed: "You're bang out of order! You're fired!" Although he later claimed: "I haven't fired him - it was a joke."
The incident is a sign of what was to come. "I thought he was serious but he wasn't," said Baker later. "We do pull each other's leg but he's never sacked me before."
The extent of his loyalty meant that despite clashing with former glamour model Heather, Baker also defended her to the hilt on several occasions.
He stepped in during her row with wedding dress designers Caroline Eavis and Annie Brown, who claimed she had reneged on an agreement that they would provide the garment for free, in exchange for publicity. Heather later agreed to pay the full Ј10,000 cost of the dress.
In March 2003, Baker also deflected true claims that Heather was pregnant, once again proving that he wouldn't let the truth get in the way of his loyalty.
In his statement last week, Sir Paul blamed Baker's unprofessional conduct for his dismissal. In truth, Baker's dealings with a woman he found it hard to like and with an increasingly demanding boss, went far beyond the call of duty.
Fortunately for Sir Paul, revenge appears unlikely. Baker remains the keeper of the music legend's secrets - and not just because he signed a confidentiality agreement.
DESPITE being dropped like a stone, he will not betray the star. Partly, friends say, it is because he fears Sir Paul but, largely, he is too loyal to do anything to harm the man whose image he defended for so long.
"There is as much chance of me writing a book about Paul as there is of me taking life seriously," he said last year.
"I could write hundreds of books about Paul but I'd never do it - even if someone put a gun to my head. It would cheapen everything."
In the fickle world of celebritydom, most stars would be grateful to have such a friend at their side.
With his demanding role as Sir Paul's PR man behind him, Baker has everything to look forward to - a peaceful life at his cottage near Devizes, in Wiltshire, a novel he is writing and clay-pigeon shooting.
Meanwhile, Sir Paul, who has cut himself off from his old support network, may soon feel Baker's absence all too keenly.
The day may yet come when he regrets turning his back on his most loyal servant.
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