Tried out various outlets for food home delivery.
Found Tesco's to be the best in organising and delivering. Sainsbury's not bad but a bit haphazard at times. Quality of food supplied (veg and fruit, fresh and crisp) was about the same. Eventually switched to 'Click and Collect' and found Tesco's even better, with better signage and little waiting time.
Waitrose, Morrisons were both totally useless, never managed to get anything booked or delivered, gave up with them.
I was listed as 'vulnerable' by Tesco's and Sainbury's very early on.