It brought back a nostalgic memory, as a small child I remember my parents and Aunts and Uncles reading these much loved books.
English seaside summers, flasks of tea and fruitcake, my Grandad burying threepenny bits in the sand for me to dig up, polo mints, tiny Union Jack flags for the sandcastles, Punch and Judy shows, deck chairs, white hairy legs with the trouser cuffs rolled up, orange penguin books ( with NO pictures) stuffed into bags with knitting and warm cardigans, and hankies, oh, and the slightly sicky smell of the inside of our Morris Oxford on the way home.
They first came into being in 1935 and sold for sixpence each. Read all about their early beginnings on Wikipedia.
I've always loved penguins.