tak opisowo wg info z Wikipedii: Royal warrants of appointment have been issued for centuries to those who supply goods or services to a royal court or certain royal personages. The warrant enables the supplier to advertise the fact that they supply to the royal family, so lending prestige to the supplier. In the United Kingdom, grants are currently made by the three most senior members of the British Royal Family to companies or tradesmen who supply goods and services to individuals in the family.

Suppliers continue to charge for their goods and services – a warrant does not imply that they provide goods and services free of charge. The warrant is typically advertised on company hoardings, letter-heads and products by displaying the coat of arms or the heraldic badge of the royal personage as appropriate. Underneath the coat of arms will usually appear the phrase "By Appointment to..." followed by the title and name of the royal customer, and then what goods are provided. No other details of what is supplied may be given.

I jeszcze na oficjalnej stronie tu: http://www.royal.gov.uk/MonarchUK/Symbols/Royalwarrants.aspx

Certyfikaty wydawane są co pięć lat, zostaje się wtedy oficjalnym dostawcą - czyli w 1841 roku przyznała go królowa Wiktoria, a teraz książę Walii.

To powinno pomóc:
http://www.princeofwales.gov.uk/the-prince-of-wales/titles-a...
http://www.uk4you.pl/certyfikaty.html
Certyfikaty przyznawane od 1155 roku dostawcom produktów i usług na dwór Królewski. Daje on gwarancje niezmiennej wysokiej jakości produktów i usług.
Obecnie w Wielkiej Brytanii wydawane są trzy certyfikaty przez:
- Elżbietę II (BY APPOINTMENT TO H.M. THE QUEEN),
- księcia Edynburga (BY APPOINTMENT TO H.R.H. THE DUKE OF EDINBURGH),
- księcia Walii (BY APPOINTMENT TO H.R.H. PRINCE OF WALES).