[4] At the end of the Second World War, Cunliffe interrupted her career to undertake voluntary relief work in Europe, from 1945 to 1947, with the Guide International Service.Cunliffe was among the first civilians to go into Belsen Concentration Camp in 1945,[5] where the volunteers oversaw the so-called "human laundry", the delousing of the inmates.In 1947 Cunliffe resumed her professional career by accepting a post as statistician at the Dublin brewers Arthur Guinness Son & Co., where she worked until 1970.Cunliffe redesigned the quality control work station so that it was equally easy to reject or accept a barrel, eliminating the prior bias and saving Guinness money in the process.She presented the Home Secretary, Roy Jenkins, with international comparisons to show that capital punishment had no effect on murder rates.