Sadly it’s not just inflexibility of Universal Credit - the base rate of Universal Credit isn’t high enough anyway, but you’ve also particularly got elderly people on state pension only, people with disabilities and people with children.

Surprisingly, the majority of food bank food apparently goes to households with at least one person in work - though this might not be “old style” work where you have set hours and wages and rights, but instead “zero hours” or “flexi hours” or “our company considers you self employed” etc.

Huge increases in gas costs are one of the biggest contributors - children, the elderly and the ill couldn’t manage to just switch the heating off all winter. Ridiculous house price/rent increases are also a massive factor.

I’m also a little unsure about a nationalised supermarket - but there are probably some solutions in this direction that would work.