Britain's heavy reliance on the destructive lend lease had a profound negative impact on their post war economy. If they had a bigger capacity to produce basic industrial products and capital goods like steel and industrial machinery to support the production of war machines, they could have avoided Lend Lease, or reduced their dependence on LL to at least Soviet's level (while LL was crucial for Soviet, Soviet's dependence on LL was far less than British Empire, despite losing a big chunk of industrial regions).
We can also argue that if British shipbuilding industry was not obsolete and more mechanized (thus requure less labour), their output would have exceeded their losses without the need of US shipbuilding programs like Liberty or other Kaiser shipyards, and hence could have won the Battle of Atlantic earlier.
German production of land warfare weapons and equipment far exceeded Britain, with the exception of trucks. Britain was very lucky to be an island as they never ever fought a land war with a similar scale of the Soviet-German front during the ww2 like either the Germand or the Russian had to.
Btw, the value of munition output of Germany far exceeded Britain, but it was heavily skewed toward land war equipment.
Well, it's had to find about the efficiency of electricity delivery back then