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I have just had an interesting thought on this. While trying to find information about this bounty money, I have discovered that at the outbreak of war the government advised pet owners to destroy their cats and dogs, as there was no ration allowance for pet animals. Many people resisted this but there were about 750,000 pets destroyed.
My thoughts are, did the government introduce this bounty to combat the inevitable increase in vermin. I may be wrong, but it is a thought