A public organisation whose purpose it is to collect mail and parcels and deliver them to the required addresses in the United Kingdom and Overseas. And they do their job well.
A Private group of scammers whose purpose it is to charge you through the nose for a service they have no intention of providing, then spend the rest of the day employing illegal immagrants to sort through all the mail to see what is worth keeping or selling.
Bob: No, what birthday card!?
Sue: Well I sent it out with the Royal Mail 5 days ago...
Bob: No, sorry.
While the window is down, said accomplish springs into action and leaps through the air passing the window. At the apex he/she lands a direct hit of flatulence delivered in the open window.
They have just delivered the "Royal Mail."