They are not essential. Bars, cafes, restaurants and takeaways serviced are to close this Wed 11.59pm. Food suppliers are supermarkets and meal kit services (My Food Bag, Hello Fresh, etc).
I do have a real difficulty regarding the meal kit services above as essential. They started off as a convenience for affluent time poor people. Having time shouldn't be a problem for anyone over the next few weeks and/or months.
Equally, the Warehouse stays open? Where does it stop.