For over 100 years, people would often have to wait a week to see the photos they had made. Film processors used photo wallets - cheery illustrated envelopes - to return pictures to clients. These showed what subjects were considered suitable for a snapshot: bright-eyed children, laughing couples, adorable pets and perfect landscapes; they also reinforced prohibitions by what they omitted. Drawing from the author's personal collection of photo wallets from the 1900s to the 1990s, Annebella Pollen's book charts a century of popular photography in Britain: the birth of a new mass leisure pastime mainly marketed towards women, the growth of camera ownership after the Second World War, and behind it all, the working conditions of the people processing the films.