What do you think everyone who is not well off is doing?
Erm, that'd be me, then.
I don't have to isolate for 12 weeks, thankfully, only 2, but if I did, then I'd be seriously considering putting all my energies into finding a freezer (as mine is bust) so I could put whatever bargains I could find into it and also so I could batch cook from scratch to save money. I'd likely borrow money to do this.
No click and collect slots available in any of the supermarkets near me, for the next 3 weeks, we looked at that the other day.
Lots of people who have been told to isolated for 12 weeks are skint, but will have to do what they can to make sure they have enough food. Handwaving this problem away by saying - oh, people who are stocking up for 12 weeks have money is missing the point by a country mile.
Many people with no money for take away / local deliveries etc are being told they need to self isolate for 12 weeks. In their position would I buy 10 packs of 20p noodles if I saw them? Yes, because it might be my only way to eat.
The solution is to get more food on the shelves, not have a go at people who are trying to survive FFS.
Don't you think the people stocking up include the vulnerable?