The Monarch decides who is able to grant a royal warrant.
A royal warrant is a mark of recognition for those who supply specific goods or services to the Royal Household.
Mrs Kenton enjoyed a rags to riches story, starting off on a clothes still in Brixton Market.
June was reportedly stripped of her title after penning a tell-all book about palace lingerie. "I can't fight with Buckingham Palace and I wouldn't want to", she said.
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Rigby & Peller began providing bespoke undergarments to the Queen from 1960, and subsequently provided products to Queen Elizabeth the Queen Mother, Princess Margaret and Countess of Snowdon among other royals.
However, Kenton did write about how she gave Princess Diana's sons, Prince William and Prince Harry, swimwear posters to put in their rooms during their time in school while supplying Diana with lingerie.
Her daughter, Jill Kenton, told the Mail: 'I'm so sad for my mum, as she actually wrote the book for her children and grandchildren.
The decision to withdraw the coveted business honor from the London-based company came after the woman entrusted with the task of fitting out the Queen took to print. "That's between you and the customer".
Royal expert and Flinders University, Associate Professor Giselle Bastin, said it was best for businesses dealing with the Royal family to keep quiet.
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Rigby & Peller confirmed the loss of the royal warrant.
"The Philip/Harrods case suggests that removal of a Royal warrant is the Royal person's equivalent of expressing publicly his or her serious displeasure - an outlet that they do not have in many other public forums".
The reason given by a Palace spokesman was a "significant decline in the trading relationship" between the Duke and the store.
Other companies that have lost their royal warrant includes Carr's Table Water biscuits, simply because they are in lower demand at the palace, and Harrods, whose owner Mohamed al Fayed allegedly angered Prince Philip with comments about the vehicle crash in 1997 that killed Princess Diana and Dodi al Fayed.
'However, the company will continue to provide an exemplary and discreet service to its clients'.
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Now there are three people, known as the grantors, who may award them - the Queen, the Duke of Edinburgh, and the Prince of Wales.