We imported a lot and didn't have the foreign currency to pay for it.
By 1945 we were spending 52% of GDP on the military and had trouble adjusting to a peacetime economy.
This also caused a shortage of USD, which were needed to service Britain's war debt and maintain imports from the United States.
The UK was forced to obtain a USD3.75 billion loan from the USA at 2% interest in December 1945.
During the Clement Atlee government, many good things happened, but taxes were increased & industries nationalised
UK government controls on milk prices through the Milk Marketing Board continued to discourage production of other varieties of cheese until the mid 1980s.
Those who say we need to be more self sufficient today, while they do things that potentially may crash the economy should perhaps heed this.
The country is having a productivity crisis where old equipment needs to be modernised to compete internationally.
Presumably in 1941 people also thought it would be short term.
I don't remember any of this being in a ballot paper.
WW2 was an act we were drawn into. 2019 is an act we are manufacturing ourselves.