Most rationing in the UK ended in 1950.
That total exhaustion of resources happened due to decolonization, and taking on much debt (Much of which was inflated away over the next decade.) As it turned out, the resource shortages didn't matter, either, due to free trade. 1945 to 1960 had the highest rate of economic growth that the UK has ever experienced.
[1] https://en.wikipedia.org/wiki/Economic_history_of_the_United...
If WW2 went on for much longer then the UK would have descended into universal abject poverty and total societal collapse.
Granted this universal suffering of the populace ushered in the social-welfare state Britain is so commonly known for nowadays, it was nonetheless devastating.