I blame that on the collapse of France.Perhaps not.
By the end of 1940 the British were broke.
Without Lend-Lease and FDR's loose interpretation of neutrality, the British faced financial collapse before the end of the 1941.
The British State managed the resources it had much better than Germany, Japan and Italy. E.g. unlike the Imperial Japanese Army and Imperial Japanese Navy, the British Army, RAF and Royal Navy, did not conscript each other's factory workers. Their inter-service co-operation was not always as good as it could have been, but it was still a lot better than the Axis.
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