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You bought the tokens from the local Co-op, and put them out with your empties, to pay your Co-op Milkman. It was supposedly a bit safer than leaving the cash for your daily pint out for him. Because the tokens were plastic, they were lighter for the Milkman to carry about, and were a safer option. When the prices of a pint of milk went up, the Co-op would change the colour of the tokens, so you could identify which token had been paid for by what amount. If you had an "old" colour token, you'd leave the extra penny, halfpenny or whatever out, to make up the token to the price. Property of Robert Pool