Tesco too. I have a disabling illness so I'm reliant on it at the best of times. At the moment I've been able to get something for 3 out of the next 4 weeks, but the 1st week in April there is nothing. If this keeps up, I'm a bit screwed. Think they need to find some way of prioritising people in genuine need, rather than people who'd just rather not go to the store. I have a gut feeling the people who are buying up all the slots are related to the people buying 17 packets of toilet roll, and sod the rest of you.
I think we're going to be moving towards a time where people in your situation will be prioritised soon, I hope we get on with it for your sake. Some of the shops are making a move in the right direction, I hope it won't be too long until they start limiting the majority of deliveries to the right people.