We were wondering, do the royals have a preferred fungal toe nail treatment? Septic tank emptier? Peep show?
Whatever they chose to endorse, that royal crest doesn't do your business any harm - it guarantees a certain standard of service and gives an assurance of top quality.
Whether they wander down Oxford Street handing out these accolades themselves or just leave it to the minions, we're unsure, but we've put together a list of some of our favourites... of the royal favourites.
The Harrods of grocery stores, Fortnum & Mason was given both the Queen and Prince Charles' exclusive stamp in 1955. Fun fact: they claim to have invented the Scotch egg. Although the Queen is known to stick to a super healthy diet of grilled meats and no carbs at dinnertime (she has reached the age of 90, after all), this is her go-to store for the eggy treats.
The royals love a spot of hunting and horseriding. Barbour is where they buy their coats, which are suitably quilted and waterproof for all their outdoor pursuits in the British drizzle.
Naturally the Queen isn't going to be seen driven around in a Ford Fiesta. Instead she favours Rollers, Daimlers and Bentleys. The latter created a unique limousine for her to be ferried around on her Golden Jubilee in 2002. She endorsed their Berkeley Square dealership in 2014.
Does Her Majesty wear lacy basques? It's one of the many lingerie garments celeb-favourite Rigby & Peller sell, as well as suspender belts and babydoll dresses. She granted them the royal warrant in 1960, so perhaps she's foxier than we thought.
When Prince Charles was given the power to hand out royal warrants, the first company he chose was men's bespoke clothing retailer Turnbull & Asser. In their own words "we have been the choice of discerning gentlemen for handmade clothing and accessories for over a century". 'Nuff said.
We can exclusively reveal that the Queen gets Bucks Palace's curtains from John Lewis (possibly), as the store has had her Royal Madge's seal of approval since 2007. Britain's favourite department store is also one of the most egalitarian, as every single employee owns a share in the company and therefore get a percentage of its profits.
The Queen is just like everyone else really, at least in terms of tucking into a big old box of chocolates. As well as endorsing Cadbury's, she likes gourmet chocolatiers Prestat. Their specialties are truffles, which they experiment with by flavouring with sake, cardamom chai and blackforest gateau.