Some years ago, Aidan Williams published two articles for Cross and Cockade, the Journal of the First World War Aviation Historical Society. The subject of both articles was the relatively little-known Engine Repair Shops of the Royal Flying Corps (later the Royal Air Force) in France during the Great War. Aidan has updated the information, added background stories, and included more photographs and extra details to introduce the history of the Engine Repair Shops to a whole new readership. In 1915, Scarborough-born Second Lieutenant Louis Frederick Rudston Fell joined the Engine Repair Shops as Assistant Equipment Officer; by 1919, he was Lieutenant Colonel L. F. R. Fell DSO OBE, and he continued to play an important role in British aero engine development up to the Second World War. In addition, Air Mechanic Thomas Boland's working day in the rotary engine section is described.