Only the Duke and Duchess of Westminster outrank the likely Labour foreign secretary and artist Nicola Green in high society ranking

It is the list on which any member of the British beau monde aspires to appear, a guide to the most significant and desirable guests to grace one’s society party this summer.

The Social Power Index, compiled each year by the upper class style bible Tatler, is the familiar home of billionaires, dukes and it girls, and for the past two years has been topped by King Charles and Queen Camilla, described as “the power, the glory and the gatekeepers” of British high society.