I had orders booked for tomorrow and next Monday and have just had emails saying the store has had to close due to staff isolating and to allow a deep clean of the store. I think it's great that Waitrose are very infection control conscious but there's no slots now until the beginning of February. Luckily I have a brexit stash but those who are shielded like me and can't get to the shops will be struggling if they can't get an alternative delivery from another supermarket. I have priority deliveries with Waitrose but nowhere else and I know slots are like gold dust round here at the moment.
I never considered that a store might have to close due to covid. Supply issues yes, especially with brexit but not the store completely closed.