SANDRINGHAM, England — It is a club that includes some of the world’s richest people. There are dukes, sheikhs, flamboyant entrepreneurs — even Queen Elizabeth II and other members of the royal family.

What they have in common besides ownership of some of Britain’s finest estates — adorned with stately homes, manicured gardens and, sometimes, racing stables — is their legal status as farmers, which means they are on the dole for European Union farm subsidies.

The queen’s idyllic 20,000-acre estate at Sandringham is among the huge holdings supported by the annual payouts, receiving more than $675,000 in European farm subsidies last year (down from $975,000 the year before).

But that could be about to change because of Britain’s decision to leave the European Union, known as Brexit.