For decades, Rigby & Peller have supplied brassieres and other foundation garments to the Royal Family. The company, founded by Jewish émigrées Gita Peller and Bertha Rigby, in 1939, was granted a royal warrant in 1960.

But now, after some 57 years, the ‘Royal Purveyors,’ as they style themselves, have been stripped of their Royal Warrant.

The rift has occurred because self-styled ‘boobologist’ June Kenton, who bought the company in 1982, revealed a little too much detail of the regal bra-fitting in her 2016 book Storm In A D-Cup.

It has been revealed this week that her company lost its royal warrant because the book recounts too many details about Her Majesty’s bra fittings, which apparently were conducted in the presence of the royal corgis.

The book also alleges that Princess Diana, who was also a Rigby and Peller client, was in the habit of taking away posters of models in lingerie for her sons to stick to the walls of their studies at Eton.

Russell Tanguay, director of warrants at the Royal Warrant Holders Association, confirmed to the Daily Express that Rigby & Peller, whose flagship store is in Knightsbridge, had lost its warrant "in the middle of last year" and should no longer display the Royal crest on any of its stores.

A spokesperson from Buckingham Palace said: “In respect of royal warrants, we never comment.”