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Bevin Boys were young British men conscripted to work in the coal mines of the United Kingdom, between December 1943 and March 1948. Chosen by lot as ten percent of all male conscripts aged 18–25, plus some volunteering as an alternative to military conscription, nearly 48,000 Bevin Boys performed vital and dangerous, but largely unrecognised service in coal mines. Many of them were not released from service until well over two years after the Second World War ended.
At the beginning of the war the Government, underestimating the value of strong younger coal miners, conscripted them into the armed forces. By mid-1943 the coal mines had lost 36,000 workers, and they were generally not replaced, because other likely young men were also being conscripted to the armed forces. The government made a plea to men liable to conscription, asking them to volunteer to work in the mines, instead, but few responded, and the manpower shortage continued.
Note that not all British coal mines would have been in England. Some would have been in other UK countries.