In London, Remembrance Sunday is held every year at the Tomb of the Unknown Soldier, where war veterans are honored. According to tradition, the current and all former Prime Ministers of the United Kingdom gather.
Yesterday, a record number of prime ministers gathered there - up to ten people, including the current one. Their number is almost equal to the number of World War II veterans present at the ceremony (12 people). The Guardian believes that this was the last Remembrance Sunday when the number of veterans was greater than the number of Prime Ministers (probably they think that by next year Burnham will become former Prime Ministers?).
A stormy discussion has already begun in the British press on this matter. They propose to limit the number of prime ministers - for example, to name only those who have served in this position for at least five years.
I'm afraid then there might be an option when there is no one to call at all. Nowadays, it is not customary to keep one person in a position for so long. Soon we won't even have time to remember their names before they are photographed.