Hope it's not bread that is tuppence a bag. The Royal Society for the Protection of Birds said it holds little nutritional value and suggested instead giving them a range of alternatives, including cake crumbs, crushed biscuits, grated cheese, leftover jacket potatoes, breakfast cereal, overripe strawberries and porridge oats. But that may cost more than tuppence.
Then, of course, there's the bag. With the ban on plastic carrier bags in effect and everybody being encouraged (courtesy, mainly, of the Daily Mail) to stop "poisoning the oceans" with their waste, it might be better if customers took their own more respectable (preferably reusable) receptacles in which to be served their goods.
Life was far simpler in 1964.