At the recreation of the Ministry of Food in 1939, he became a meat agent and after the end of the Second World War, he entered the British House of Commons, sitting for Salford West. He was elected president of the Manchester and Saiford Meat Association in 1942, a post he held until the following year. During his time in the House, Royle was appointed a Lord of the Treasury in 1950 and one year later, became an opposition whip until 1954.
This sequence of events led to Royle's involvement with the Ministry of Food in 1939, where he served as a meat official. Following World War II, he entered Parliament, representing Salford West. He was elected president of the Manchester and Salford Meat Association in 1942, a position he held until the next year. During his time in Parliament, Royle was appointed Lord of the Treasury in 1950 and became opposition leader one year later until 1954.