We had a delivery from Ocado today - we get this once per week. They bring food and other necessities.
But not today.
Apparently they had a "technical problem" and all the food we ordered, didn't reach us, except for two loaves of bread and five bananas (we didn't order fish).
They offered us a slot on Saturday, but that's too late. They've lost the sale. Fortunately, we also have deliveries from Waitrose, because an important principle of computer security is "Don't have a single point of failure".
So we aren't going to starve.