Eat only UK Plants/ Rationing

Firstly I'd cheat and have my 16 points for July even though its only two weeks and stock up on the allotted longlife milk, butter and eggs plus the rest allowed. That would give me an idea of how things were working out so as to plan my next month.  If I was on my own it would be good to join you in the experiment.

When war broke out, most households would have had some food in their cupboards anyway but they wouldn't have had the luxury of a freezer full of grub, as we do. I've read that people were encouraged to buy a week's worth of food, before rationing started as that meant food was being stored safely, instead of in bulk in warehouses where it could be bombed.
Its a bit like lockdown during Covid, I had enough food in the house that I didn't need to rush to the shops panic buying. I could do the same now if I wanted to - so, instead of "buying" rations from the shop, I'm "buying" it from my storecupboard as a way of using it up!

I'm surprised you haven't said that P lived through rationing once and doesn't want to do it again.