We managed to find a slot with Stay home drink wine and snuggle with my dogs quarantine shirt and when we found it it was at 2am. Keep trying in the evening/night, I guess they are being added constantly. Have you tried Morrisons? It’s still a nightmare to get through the queue and get a slot but their essential food box are not too hard to get. I have tried Morrisons food boxes they are saying they are sold out. Tried Morrisons online there is a message saying they have no delivery slots even after waiting in a queue. Both myself and my husband are elderly and not in good health there is no priority for us. Tied all the supermarkets none of them have any slots at all not enen weeks ahead. No alternative but to go out even though we don’t want to.
In our Stay home drink wine and snuggle with my dogs quarantine shirt there are groups of people offering to go buy groceries for elderly persons or what are not able to make the trip. I’m sure you can find locally someone that does this. I see you live in london, i am pretty sure there are young people that do this for free. I had the same issue at first, all their boxes sold out. But I went on the website at midnight and managed to get a food box after queuing. Its very unfortunate & unfair that there aren’t more slots for the elderly and vulnerable. I really hope that Tesco and others make more slots available for the vulnerable.