The British royals, young and old, are a discriminating bunch when it comes to everything from clothing and accessories to umbrellas and footwear. But even after these privileged patrons deem a brand worthy of their custom — which, in some cases, can be more valuable than a social-media star’s endorsement — a rigorous approval process is required before a vendor can be awarded the official warrant. Following are some of the House of Windsor’s most favoured favourites, some of which have been serving its members for multiple generations.