When were British silver threepenny bit coins withdrawn from general circulation?

British silver threepenny bit coins were minted up until 1945. The brass threepenny bit coins made to replace them were made from 1937 onwards. So for a few years they circulated together, presumably to test the publics reaction to the new coins. But does anyone know when the silver ones were actually stopped being... show more British silver threepenny bit coins were minted up until 1945. The brass threepenny bit coins made to replace them were made from 1937 onwards. So for a few years they circulated together, presumably to test the publics reaction to the new coins. But does anyone know when the silver ones were actually stopped being used in change? Was it in 1945, or later, or earlier?
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