The purpose of this book is to set out in an easily readable and well-illustrated form the structure of each Line Infantry Regiment from 1881 up until the beginning of the First World War, a setup which can often be seen referred to as the 'Regimental Family'. The book follows on from A Guide to the British Army's Numbered Infantry Regiments of 1751-1881, published by The Naval & Military Press in 2018. The new 'Territorial' or 'Country Regiments' have all been dealt with, along with their associated Militia, Volunteer and Territorial Force Battalions and affiliated Cadet units. The book is illustrated with 627 colour plates and contemporary photographs and will be a worthy addition to the 'Guide' series of British Army reference works.