<someone who wrote to a biscuit company suggesting that as the top biscuit in the packet usually
turned out to be broken into little pieces, they leave the top biscuit out in future>

Which reminds me, Bingley, that such a person in Tasmania (at least) would be known (politically incorrectly) as one biscuit short of a packet

… and, while we're on this subject, where have all the broken biscuits gone -- an essential part of a young fella's diet in the mid-50s.