In addition to the prospect of World War Three, 2026 has seen global oil shortages and mass flight cancellations. But there’s one shortage which has hit me and other office workers a little harder than any of those. Pret A Manger’s “jambon beurre” sandwich, a small French–style “losange” bread roll with butter, ham and cornichons inside, has disappeared from most of the chain’s shelves in recent weeks. Like many, I pop into Pret when I’m in a hu…