Every year 30,000 lucky people get to attend a spectacular Buckingham Palace garden party.
Anyone who has attended will tell you how much planning clearly goes into each event. But most will talk about the catering, or the security, as well, of course, as having the chance to chat to members of the Royal Family.
But few will realise just how much extra effort goes into making the Buckingham Palace gardens just right for each occasion.
This official video shows just what goes on behind the scenes in fascinating detail.
Did you know, for example, that the sprawling lawns upon which the thousands of guests mingle and enjoy perfect sandwiches, is cut beforehand to exactly 21 millimeters, and cut in two directions to leave a wonderful criss-cross pattern?
Watch to find out more…